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<front>
<journal-meta>
<journal-id journal-id-type="publisher-id">Front. Educ.</journal-id>
<journal-title>Frontiers in Education</journal-title>
<abbrev-journal-title abbrev-type="pubmed">Front. Educ.</abbrev-journal-title>
<issn pub-type="epub">2504-284X</issn>
<publisher>
<publisher-name>Frontiers Media S.A.</publisher-name>
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<article-meta>
<article-id pub-id-type="doi">10.3389/feduc.2023.1194963</article-id>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Education</subject>
<subj-group>
<subject>Original Research</subject>
</subj-group>
</subj-group>
</article-categories>
<title-group>
<article-title>Flipped classroom in physics teacher education: (how) can students&#x00027; expectations be met?</article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author" corresp="yes">
<name><surname>Bitzenbauer</surname> <given-names>Philipp</given-names></name>
<xref ref-type="corresp" rid="c001"><sup>&#x0002A;</sup></xref>
<uri xlink:href="http://loop.frontiersin.org/people/2229420/overview"/>
</contrib>
<contrib contrib-type="author">
<name><surname>Hennig</surname> <given-names>Fabian</given-names></name>
</contrib>
</contrib-group>
<aff><institution>Faculty of Physics and Earth Sciences, Institute of Physics Education, Leipzig University</institution>, <addr-line>Leipzig</addr-line>, <country>Germany</country></aff>
<author-notes>
<fn fn-type="edited-by"><p>Edited by: Davinia Palomares-Montero, University of Valencia, Spain</p></fn>
<fn fn-type="edited-by"><p>Reviewed by: Wahyu Widada, University of Bengkulu, Indonesia; Diana Marin-Suelves, University of Valencia, Spain</p></fn>
<corresp id="c001">&#x0002A;Correspondence: Philipp Bitzenbauer <email>philipp.bitzenbauer&#x00040;uni-leipzig.de</email></corresp>
</author-notes>
<pub-date pub-type="epub">
<day>16</day>
<month>05</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="collection">
<year>2023</year>
</pub-date>
<volume>8</volume>
<elocation-id>1194963</elocation-id>
<history>
<date date-type="received">
<day>27</day>
<month>03</month>
<year>2023</year>
</date>
<date date-type="accepted">
<day>28</day>
<month>04</month>
<year>2023</year>
</date>
</history>
<permissions>
<copyright-statement>Copyright &#x000A9; 2023 Bitzenbauer and Hennig.</copyright-statement>
<copyright-year>2023</copyright-year>
<copyright-holder>Bitzenbauer and Hennig</copyright-holder>
<license xlink:href="http://creativecommons.org/licenses/by/4.0/"><p>This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.</p></license> </permissions>
<abstract>
<p>In this paper, we describe the development of a flipped classroom concept for physics teacher education along (a) design criteria from the literature, and (b) students&#x00027; needs and expectations extracted from an exploratory pre-study (<italic>N</italic> &#x0003D; 21). We implemented it in a physics education course at Leipzig University, Germany, and report results of its empirical evaluation (<italic>N</italic> &#x0003D; 29). Our results hint at both, strengths and weaknesses of the developed flipped classroom concept, and hence, pave the way for further research into the use of flipped classroom scenarios in physics teacher education.</p></abstract>
<kwd-group>
<kwd>flipped classroom</kwd>
<kwd>physics education</kwd>
<kwd>teacher education</kwd>
<kwd>design criteria</kwd>
<kwd>evaluation</kwd>
</kwd-group>
<counts>
<fig-count count="3"/>
<table-count count="10"/>
<equation-count count="0"/>
<ref-count count="69"/>
<page-count count="13"/>
<word-count count="9779"/>
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<custom-meta-wrap>
<custom-meta>
<meta-name>section-at-acceptance</meta-name>
<meta-value>Teacher Education</meta-value>
</custom-meta>
</custom-meta-wrap>
</article-meta>
</front>
<body>
<sec sec-type="intro" id="s1">
<title>1. Introduction</title>
<p>Courses on physics education are an essential part of physics teacher education programs to foster pre-service teachers&#x00027; professional development, in particular with regards to pedagogical content knowledge. The flipped classroom model is a promising approach to such courses, as it has been shown to help prevent the development of inert knowledge (cf. Schwichow, <xref ref-type="bibr" rid="B54">2021</xref>; Fidan, <xref ref-type="bibr" rid="B18">2023</xref>). Strelan et al. (<xref ref-type="bibr" rid="B61">2020</xref>) stated that the &#x0201C;flipped classroom has become a popular and strongly advocated approach to student learning in the K-12 sector as well as in higher education&#x0201D; (p. 3). Prior research has investigated the implementation of flipped classroom scenarios in physics teacher education and brought forth different advantages, but also special pitfalls (Schwichow, <xref ref-type="bibr" rid="B54">2021</xref>). In this paper we describe the development of a flipped classroom concept for physics teacher education (see Section 3) along (a) design criteria from the literature (see Section 2.2), and (b) students&#x00027; needs and expectations extracted from an exploratory study (see Section 3.2). We implemented it in a physics education course at Leipzig University, Germany, and in this article we report the results of its empirical evaluation (see Sections 4&#x02013;6) which pave the way for further research into the use of flipped classroom scenarios in physics teacher education.</p></sec>
<sec id="s2">
<title>2. Research background</title>
<sec>
<title>2.1. The flipped classroom method: an overview</title>
<p>In traditional university physics instruction, learning primarily takes place in class during face-to-face sessions, and separate sessions are dedicated to practice new topics in exercise series. The flipped classroom, sometimes also referred to as <italic>inverted classroom</italic>, offers an alternative approach (cf. Sams and Bergmann, <xref ref-type="bibr" rid="B52">2012</xref>): According to Finkenberg and Trefzger (<xref ref-type="bibr" rid="B19">2019</xref>), the flipped classroom &#x0201C;inverts traditional teaching methods by delivering direct instruction in online videos to be watched at home while typical homework activity is moved into the classroom&#x0201D; (p. 1). In more general, Lage et al. (<xref ref-type="bibr" rid="B40">2000</xref>) state: &#x0201C;Inverting the classroom means that events that have traditionally taken place inside the classroom now take place outside the classroom and vice versa&#x0201D; (p. 32).</p>
<p>In educational research, there is not a single definition of the flipped classroom (cf. Wei&#x000DF; and Friege, <xref ref-type="bibr" rid="B66">2021</xref>). According to Strayer (<xref ref-type="bibr" rid="B60">2012</xref>), for example, flipped formats can be considered a special type of blended learning (Graham, <xref ref-type="bibr" rid="B28">2006</xref>; Sharma, <xref ref-type="bibr" rid="B56">2010</xref>; O&#x00027;Flaherty and Phillips, <xref ref-type="bibr" rid="B46">2015</xref>; Hrastinski, <xref ref-type="bibr" rid="B31">2019</xref>). Although there are scholars who do not consider the e-learning aspect a necessary prerequisite in flipped classroom approaches (cf. Abeysekera and Dawson, <xref ref-type="bibr" rid="B1">2015</xref>). Flipped classroom scenarios are, indeed, most often enriched through the use of different communication and information technologies. These technologies are intended to support student learning and offer the possibility to design a flexible course (Sams and Bergmann, <xref ref-type="bibr" rid="B52">2012</xref>). However, both He et al. (<xref ref-type="bibr" rid="B30">2016</xref>) and Ozdamli and A&#x0015F;&#x00131;ksoy (<xref ref-type="bibr" rid="B47">2016</xref>) argue that the flipped classroom should not be confused with students only watching online videos prior to class. Instead, the authors focus on interactive activities during the face-to-face lessons being a main feature of flipped classroom formats.</p>
<p>As mentioned earlier, one of the key advantages of flipped courses is that learners are given the opportunity to prepare for face-to-face sessions individually, i.e., according to their own schedule or prior knowledge (Foertsch et al., <xref ref-type="bibr" rid="B21">2002</xref>; Dean et al., <xref ref-type="bibr" rid="B14">2013</xref>). In a self-study phase, the learners are expected to independently engage with different preparation materials (Talbert, <xref ref-type="bibr" rid="B64">2017</xref>). This requires the students to change their study behavior, e.g., with respect to time management (Boeve et al., <xref ref-type="bibr" rid="B9">2017</xref>). Therefore, the flipped classroom approach is associated with a need of high students&#x00027; self-regulation (Hwang et al., <xref ref-type="bibr" rid="B32">2015</xref>) which can pose obstacles to students with a lower degree of self-regulation skills (Hypp&#x000F6;nen et al., <xref ref-type="bibr" rid="B33">2019</xref>).</p>
<p>Recent studies have shown that high coherence between the activities in the self-study phase and those during the lessons (Prober and Khan, <xref ref-type="bibr" rid="B48">2013</xref>) may have a positive impact on student learning. In line with this, Elen and Clarebout (<xref ref-type="bibr" rid="B17">2001</xref>) and Buerck et al. (<xref ref-type="bibr" rid="B11">2003</xref>) showed that a perceived lack of coherence between the in-person sessions and the self-study phase discouraged students from engaging in certain activities. Moreover, students found flipped events to be more motivating if the sessions were technology-enhanced (Dean et al., <xref ref-type="bibr" rid="B14">2013</xref>). In this regard, the studies by Lin (<xref ref-type="bibr" rid="B41">2021</xref>) or Sangerm&#x000E1;n Jim&#x000E9;nez et al. (<xref ref-type="bibr" rid="B53">2021</xref>) revealed that input videos are preferred most by students for the self-study phase. Instructional videos allow students to pause the learning process and review the content as often as necessary (Su&#x000E1;rez et al., <xref ref-type="bibr" rid="B62">2021</xref>) while, in contrast, Bishop and Verleger (<xref ref-type="bibr" rid="B7">2013</xref>) argues that texts are usually only read superficially by students. It should be noted, that students often fall for the &#x0201C;illusion of understanding&#x0201D; when learning with instructional videos (Kulgemeyer and Wittwer, <xref ref-type="bibr" rid="B36">2022</xref>), and thus, it is crucial to support students when working with a video, e.g., through in-depth tasks (Werner et al., <xref ref-type="bibr" rid="B67">2018</xref>) in order to prevent the self-study phase from becoming inefficient (Fischer and Spannagel, <xref ref-type="bibr" rid="B20">2012</xref>). Beyond videos, instructors may choose from a cornucopia of resources to support student preparation for face-to-face lessons in the context of flipped classroom settings, e.g., via quizzes (Ruiz, <xref ref-type="bibr" rid="B50">2021</xref>).</p>
<p>Due to the self-study phase, during the in-person sessions, instructors can focus on the promotion of higher cognitive activities (Abeysekera and Dawson, <xref ref-type="bibr" rid="B1">2015</xref>) among their students. The implementation of collaborative learning activities has special value (Bishop and Verleger, <xref ref-type="bibr" rid="B7">2013</xref>) and is positively valued by students (McNally et al., <xref ref-type="bibr" rid="B43">2017</xref>). Consequently, the role of instructors is changed compared to traditional instruction. However, according to Fredriksen (<xref ref-type="bibr" rid="B24">2021</xref>) this &#x0201C;may be contrary to the belief of many that the teacher becomes less important&#x0201D; (p. 17). It has been shown that flipped classroom participants, overall, seem to be more amenable to collaborative learning activities (cf. Strayer, <xref ref-type="bibr" rid="B60">2012</xref>), and, outperform students participating in traditional instruction (Kurup and Hersey, <xref ref-type="bibr" rid="B38">2012</xref>; Foldnes, <xref ref-type="bibr" rid="B22">2016</xref>). It is noteworthy, however, that simply providing collaborative work assignments does not directly lead to learners deepening their collaboration (Kim et al., <xref ref-type="bibr" rid="B35">2014</xref>). According to Foreman (<xref ref-type="bibr" rid="B23">2003</xref>), teachers need to provide feedback to their students. Moreover, integrating elements of formative assessment from time to time throughout the course is recommended (Talbert, <xref ref-type="bibr" rid="B64">2017</xref>).</p>
</sec>
<sec>
<title>2.2. Design principles of flipped classroom scenarios</title>
<p>Brame (<xref ref-type="bibr" rid="B10">2013</xref>) presented four design principles for the development of flipped classroom courses (cf. <xref ref-type="table" rid="T1">Table 1</xref>). Kim et al. (<xref ref-type="bibr" rid="B35">2014</xref>) conducted a mixed methods study at three different universities for which they used the Revised Community of Inquiry Framework (Garrison et al., <xref ref-type="bibr" rid="B27">1999</xref>; Shea et al., <xref ref-type="bibr" rid="B58">2012</xref>; Swan et al., <xref ref-type="bibr" rid="B63">2012</xref>), abbreviated as RCOI, to design a framework for flipped courses. The RCOI assumes that collaborative interactions in online or blended learning environments are particularly useful to support student learning (Shea and Bidjerano, <xref ref-type="bibr" rid="B57">2010</xref>; Shea et al., <xref ref-type="bibr" rid="B58">2012</xref>). As a result of their study, Kim et al. (<xref ref-type="bibr" rid="B35">2014</xref>) defined four dimensions, namely the cognitive presence, the social presence, the teaching presence and, lastly, the learner presence. The corresponding design principles for flipped classroom courses are listed in <bold>Table 4</bold> and are connected to the core ideas underlying the development of a flipped classroom course into physics education for pre-service physics teachers presented in Section 3 of this article.</p>
<table-wrap position="float" id="T1">
<label>Table 1</label>
<caption><p>Design principles for flipped classroom courses according to Brame (<xref ref-type="bibr" rid="B10">2013</xref>).</p></caption> 
<table frame="box" rules="all">
<thead>
<tr style="background-color:&#x00023;919498;color:&#x00023;ffffff">
<th valign="top" align="left"><bold>Principle</bold></th>
<th valign="top" align="left"><bold>Explanation</bold></th>
</tr>
</thead>
<tbody>
<tr>
<td valign="top" align="left">Provide an opportunity for students to gain first exposure prior to class.</td>
<td valign="top" align="left">Following this principle, students should be provided with sufficient opportunities to prepare adequately for their lessons.</td>
</tr>
<tr>
<td valign="top" align="left">Provide an incentive for students to prepare for class.</td>
<td valign="top" align="left">According to this principle, it is important to offer learners incentives to engage with the learning materials.</td>
</tr>
<tr>
<td valign="top" align="left">Provide a mechanism to assess student understanding.</td>
<td valign="top" align="left">This principle suggests that assignments given to students should serve as an indicator for both the learner and the teacher to evaluate the understanding of the topics.</td>
</tr>
<tr>
<td valign="top" align="left">Provide in-class activities that focus on higher level cognitive activities.</td>
<td valign="top" align="left">For example, collaborative learning methods are recommended to be utilized during the face-to-face sessions.</td>
</tr></tbody>
</table>
</table-wrap>
</sec>
<sec>
<title>2.3. The flipped classroom method in physics and physics teacher education</title>
<p>Flipped classroom scenarios have already been widely implemented in physics and science courses at different educational levels in the past (cf. Deslauriers et al., <xref ref-type="bibr" rid="B15">2011</xref>; A&#x0015F;&#x00131;ksoy and &#x000D6;zdaml&#x00131;, <xref ref-type="bibr" rid="B5">2016</xref>). In order to examine the potential benefits of flipped courses in physics education, Christian et al. (<xref ref-type="bibr" rid="B13">2019</xref>) conducted a pre-post-test study with a total of 64 students divided into two groups. One group was instructed using a flipped approach, while the other received traditional instruction. Analysis of the results indicated that the students who were taught through the flipped classroom approach demonstrated significantly better performance than their counterparts who received traditional instruction. Sengel (<xref ref-type="bibr" rid="B55">2014</xref>) conducted a pre-post-test study to investigate the effectiveness of flipped courses in teaching physics topics to university students. The study revealed that students who were instructed using the flipped classroom approach outperformed their peers who received traditional instruction, despite initial difficulties with the new method. Additionally, an increased willingness to participate in the course was observed among the students of the flipped classroom group. Similar conclusions were drawn from additional research that examined the effectiveness of flipped and face-to-face classrooms in teaching science, in terms of both student perceptions and learning outcomes (cf. A&#x0015F;&#x00131;ksoy and &#x000D6;zdaml&#x00131;, <xref ref-type="bibr" rid="B5">2016</xref>; Capone et al., <xref ref-type="bibr" rid="B12">2017</xref>; Bawaneh and Moumene, <xref ref-type="bibr" rid="B6">2020</xref>; Stratton et al., <xref ref-type="bibr" rid="B59">2020</xref>; Aidoo et al., <xref ref-type="bibr" rid="B2">2022a</xref>; Fung et al., <xref ref-type="bibr" rid="B26">2022</xref>; Zeitoun et al., <xref ref-type="bibr" rid="B69">2023</xref>).</p>
</sec>
<sec>
<title>2.4. Research rationale</title>
<p>The use of flipped classroom scenarios in physics teacher education is an emerging trend, with educators exploring their potential benefits as we have shown in the above sections. However, there is a lack of empirical evidence regarding their effectiveness in meeting students&#x00027; expectations. This research aims to analyze whether a flipped classroom physics education course developed alongside design principles from the literature (see Section 2.2) can meet students&#x00027; expectations in physics teacher education. The concept presented in this article (see Section 3), which considers students&#x00027; needs and expectations extracted from an exploratory study (details on this pre-study are given in Section 3.2), seems promising with regards to enhancing the learning experience of physics pre-service teachers. The empirical evaluation of the implemented flipped classroom concept presented from Section 4 onwards is intended to reveal strengths and weaknesses. Hence, this research will contribute to the development of effective flipped classroom scenarios in physics teacher education that meet students&#x00027; expectations and enhance their learning experience.</p></sec></sec>
<sec id="s3">
<title>3. Design of a pre-service teachers&#x00027; physics education course using flipped classroom</title>
<p>In this section, we locate the flipped physics education course described in this paper within the education context of physics teacher educational at Leipzig University, Germany (see Section 3.1). Then we report results of an exploratory pre-study which we conducted to collect pre-service physics teachers&#x00027; expectations of and needs for physics education courses (see Section 3.2). Taken together the students&#x00027; expectations and needs on the one hand, and the design principles for flipped classroom courses from the literature on the other hand (see Section 2.2), we derived key ideas for the development of our flipped classroom course on physics education which we describe in Section 3.3.</p>
<sec>
<title>3.1. Educational context</title>
<p>The Standing Conference of the Ministers of Education and Cultural Affairs of the L&#x000E4;nder in Germany established guidelines for teacher education by specifying content requirements for subject disciplines and subject matter didactics (Kultusministerkonferenz, <xref ref-type="bibr" rid="B37">2019</xref>). These guidelines consist of standards that must be met by teacher education programs in Germany, which is composed of three phases taking place in various educational institutions. During the initial phase of teacher education, students acquire competences related to subject disciplines, working methods, and subject matter didactics (Kultusministerkonferenz, <xref ref-type="bibr" rid="B37">2019</xref>, p. 3) through their university studies.</p>
<p>The flipped classroom course on physics education presented in this paper is situated within this first phase of teacher education. More specifically, it is designed for fifth semester students. The introductory physics education course at Leipzig University is scheduled after students&#x00027; have been introduced to experimental physics on mechanics, electrodynamics, thermodynamics, optics, quantum optics and atomic physics as well as theoretical mechanics in semesters one to four. During the first four semesters, the students additionally participate in typical laboratory courses.</p>
</sec>
<sec>
<title>3.2. Collection of pre-service teachers&#x00027; expectations of and needs for an introductory physics education course&#x02014;A pre-study</title>
<p>Prior to course development, we explored pre-service teachers&#x00027; expectations of and needs for their physics education courses in an exploratory manner. In this sub-section, we report the design and results of this exploratory study. The results of this pre-study informed the formulation of design principles underlying course development.</p>
<sec>
<title>3.2.1. Study design, research question, and sample</title>
<p>We conducted an exploratory questionnaire study to answer the following research question: What are the needs and expectations of pre-service teachers regarding an introductory physics education course within their academic program?</p>
<p>Informations on the instrument used are given in Section 3.2.2. A total of 21 students enrolled in the physics teacher education program at Leipzig University responded to the questionnaire. None of the respondents had taken part in a physics education course prior to participating in this pre-study.</p></sec>
<sec>
<title>3.2.2. Instrument</title>
<p>The questionnaire consisted of two open-ended questions. The first question was used to collect students&#x00027; expectations of the introductory physics education course, while the second question was devoted to gathering students&#x00027; needs for this course. The questionnaire was implemented using the online tool SoSci Survey (<ext-link ext-link-type="uri" xlink:href="https://www.soscisurvey.de/">https://www.soscisurvey.de/</ext-link>) and was password protected. Target group students were given access to the questionnaire during a limited time window of 5 days and participation was possible only once.</p></sec>
<sec>
<title>3.2.3. Data analysis</title>
<p>Qualitative content analysis was used to analyze the data (Mayring, <xref ref-type="bibr" rid="B42">2004</xref>). Students&#x00027; full-text responses were inductively categorized by two independent raters, with any discrepancies being resolved through discussion until complete agreement was reached. Duplicate occurrences of a specific category in a participant&#x00027;s response are excluded from the coding process as they do not contribute new insights into the participant&#x00027;s expectations or needs, and hence, may be redundant (cf. Bitzenbauer and Meyn, <xref ref-type="bibr" rid="B8">2021</xref>). Lastly, frequency analysis was applied to determine the occurrence of the respective categories.</p></sec>
<sec>
<title>3.2.4. Results</title>
<p>Based on the students&#x00027; answers to the first question on students&#x00027; expectations of the introductory physics education course, seven categories were formed. In <xref ref-type="table" rid="T2">Table 2</xref>, the categories are summarized alongside anchor examples and the number of occurrences among the 21 respondents. The results of the analysis show that the students have various expectations of the introductory physics education course. On the one hand, they expect solid theoretical foundations and fundamental concepts of physics education (12 occurrences), and on the other hand, they also have expectations with regards to practical application of the acquired knowledge. For example, they want to learn about instructional sequences for teaching physics concepts (9 occurrences) and would like to apply their theoretical knowledge immediately through exercises or similar means (3 occurrences). Additionally, some students express interest in promoting students&#x00027; interest and motivation in physics education (3 occurrences) and in getting to know students&#x00027; learning difficulties in physics and how to address them (2 occurrences). Finally, a few students expect to learn how to create specific teaching materials for physics instruction and what tools are available for this purpose (2 occurrences).</p>
<table-wrap position="float" id="T2">
<label>Table 2</label>
<caption><p>Students&#x00027; expectations of their introductory physics education course alongside anchor examples (freely translated from German) and the number of occurrences.</p></caption> 
<table frame="box" rules="all">
<thead>
<tr style="background-color:&#x00023;919498;color:&#x00023;ffffff">
<th valign="top" align="left"><bold>Category</bold></th>
<th valign="top" align="left"><bold>Anchor example</bold></th>
<th valign="top" align="left"><bold>Frequency</bold></th>
</tr>
</thead>
<tbody>
<tr>
<td valign="top" align="left">Learning about key aspects of physics education</td>
<td valign="top" align="left">&#x0201C;I expect to become familiar with fundamental concepts and theories of physics education.&#x0201D;</td>
<td valign="top" align="left">12</td>
</tr>
<tr>
<td valign="top" align="left">School relevance</td>
<td valign="top" align="left">&#x0201C;I hope that the conveyed basics of physics education are always presented with a direct reference to school practice and a relevance is demonstrated.&#x0201D;</td>
<td valign="top" align="left">12</td>
</tr>
<tr>
<td valign="top" align="left">Learning about instructional sequences for teaching physics concepts</td>
<td valign="top" align="left">&#x0201C;I would like to learn how to effectively prepare and teach various topics in physics in the classroom.&#x0201D;</td>
<td valign="top" align="left">9</td>
</tr>
<tr>
<td valign="top" align="left">Promotion of students&#x00027; interest and motivation in physics education</td>
<td valign="top" align="left">&#x0201C;I expect to be shown ways to arouse interest in physics.&#x0201D;</td>
<td valign="top" align="left">3</td>
</tr>
<tr>
<td valign="top" align="left">Implementation of theoretical knowledge in practical settings</td>
<td valign="top" align="left">&#x0201C;I would like to have the opportunity to apply learned knowledge immediately, for example, in the form of exercises or similar.&#x0201D;</td>
<td valign="top" align="left">3</td>
</tr>
<tr>
<td valign="top" align="left">Getting to know students&#x00027; learning difficulties in physics</td>
<td valign="top" align="left">&#x0201C;I would like to learn about common physics-specific difficulties that students often face and how to address them in my teaching.&#x0201D;</td>
<td valign="top" align="left">2</td>
</tr>
<tr>
<td valign="top" align="left">Creation of physics teaching materials</td>
<td valign="top" align="left">&#x0201C;I expect to learn from the physics education courses how to create specific teaching materials for physics instruction and what tools are available for this purpose.&#x0201D;</td>
<td valign="top" align="left">2</td>
</tr></tbody>
</table>
</table-wrap>
<p>Based on the students&#x00027; answers to the second question on students&#x00027; needs for the introductory physics education course, another eight categories were formed. In <xref ref-type="table" rid="T3">Table 3</xref>, the categories are summarized alongside anchor examples and the number of occurrences among the 21 respondents. The results of the analysis of students&#x00027; needs for the introductory physics education course show that students have both general needs, such as a good working atmosphere and accessibility of lecturers, as well as needs that are strongly connected to physics education, such as school relevance and exam preparation. Interestingly, some categories of needs, such as school relevance, are similar to categories found in the expectations table. This indicates that students have (a) clear expectations of the course and (b) a clear idea of what they need to succeed. Based on these findings, along with design principles from the literature, we developed a flipped classroom course on physics education, which will be described in the next Section 3.3.</p>
<table-wrap position="float" id="T3">
<label>Table 3</label>
<caption><p>Students&#x00027; needs for their introductory physics education course alongside anchor examples (freely translated from German) and the number of occurrences.</p></caption> 
<table frame="box" rules="all">
<thead>
<tr style="background-color:&#x00023;919498;color:&#x00023;ffffff">
<th valign="top" align="left"><bold>Category</bold></th>
<th valign="top" align="left"><bold>Anchor example</bold></th>
<th valign="top" align="left"><bold>Frequency</bold></th>
</tr>
</thead>
<tbody>
<tr>
<td valign="top" align="left">Good working atmosphere</td>
<td valign="top" align="left">&#x0201C;Good collaboration and work atmosphere are important to me.&#x0201D;</td>
<td valign="top" align="left">12</td>
</tr>
<tr>
<td valign="top" align="left">Accessibility of the lecturers</td>
<td valign="top" align="left">&#x0201C;I expect that when I have questions or problems, the contact persons will be available to help and provide guidance.&#x0201D;</td>
<td valign="top" align="left">7</td>
</tr>
<tr>
<td valign="top" align="left">School relevance</td>
<td valign="top" align="left">&#x0201C;I need many vivid and practice-relevant examples in order to take away something for my professional life as a physics teacher from the physics didactic content.&#x0201D;</td>
<td valign="top" align="left">5</td>
</tr>
<tr>
<td valign="top" align="left">Transparent course organization</td>
<td valign="top" align="left">&#x0201C;I would like to have planning security and would therefore appreciate timely scheduling (and adherence) of the exam date.&#x0201D;</td>
<td valign="top" align="left">4</td>
</tr>
<tr>
<td valign="top" align="left">Exam preparation</td>
<td valign="top" align="left">&#x0201C;I have an urgent need for as much transparency as possible regarding exam topics, and for targeted preparation for them&#x0201D;</td>
<td valign="top" align="left">4</td>
</tr>
<tr>
<td valign="top" align="left">Appropriate workload for the intended credit points</td>
<td valign="top" align="left">&#x0201C;The workload in the course should be appropriate to the intended credit point value.&#x0201D;</td>
<td valign="top" align="left">3</td>
</tr>
<tr>
<td valign="top" align="left">Literature suggestions</td>
<td valign="top" align="left">&#x0201C;I would appreciate additional literature suggestions.&#x0201D;</td>
<td valign="top" align="left">3</td>
</tr>
<tr>
<td valign="top" align="left">Collaborative methods</td>
<td valign="top" align="left">&#x0201C;I see a need to apply physics didactics content immediately in collaborative formats together with my fellow students and to train with a focus on physics lessons.&#x0201D;</td>
<td valign="top" align="left">3</td>
</tr></tbody>
</table>
</table-wrap>
</sec>
</sec>
<sec>
<title>3.3. Description of the course and the implementation of the design principles</title>
<p>The course is organized around a Flipped Classroom concept, where students learn about fundamental topics of physics education through interactive digital learning resources called LearningBits (e.g., interactive h5p videos, quizzes etc.), which they access through an online course (cf. K&#x000FC;sel and Markic, <xref ref-type="bibr" rid="B39">2021</xref>). The LearningBits enable students to prepare for the in-person sessions and provide transparent competence expectations. The analog in-person sessions provide an opportunity for students to deepen their understanding through discussion and analysis of preparation tasks. The sessions also analyze practical examples, such as the handling of preconceptions in physics education and experimentation situations, through reflection on theoretical insights. To assist students with any questions, a Helpdesk is offered as an online session each week. The implementation of the design principles by Kim et al. (<xref ref-type="bibr" rid="B35">2014</xref>) in our introductory flipped classroom physics education course is detailed in <xref ref-type="table" rid="T4">Table 4</xref>.</p>
<table-wrap position="float" id="T4">
<label>Table 4</label>
<caption><p>Implementation of the design principles according to Kim et al. (<xref ref-type="bibr" rid="B35">2014</xref>) in the development of our introductory physics education course in the flipped classroom format implemented at Leipzig University, Germany.</p></caption> 
<table frame="box" rules="all">
<thead>
<tr style="background-color:&#x00023;919498;color:&#x00023;ffffff">
<th valign="top" align="left"><bold>Design principle</bold></th>
<th valign="top" align="left"><bold>Our implementation</bold></th>
</tr>
</thead>
<tbody>
<tr>
<td valign="top" align="left">Provide facilitation for building a learning community.</td>
<td valign="top" align="left">Our facilitated tasks promote social interaction, allowing students to form groups and communicate.</td>
</tr>
<tr>
<td valign="top" align="left">Provide technologies familiar and easy to access.</td>
<td valign="top" align="left">We provide all content on Moodle, which is used by every student since their first semester.</td>
</tr>
<tr>
<td valign="top" align="left">Provide an opportunity for students to gain first exposure prior to class.</td>
<td valign="top" align="left">Our students are given 6 days to work on the LearningBits prior to the face-to-face sessions.</td>
</tr>
<tr>
<td valign="top" align="left">Provide clear connection between in-class and out-of-class activities.</td>
<td valign="top" align="left">Tasks in face-to-face events correspond to self-study materials to foster students&#x00027; knowledge application.</td>
</tr>
<tr>
<td valign="top" align="left">Provide clearly defined and well-structured guidance.</td>
<td valign="top" align="left">We provide a weekly overview of the current (content) status within the semester and also list the tasks currently to be completed there.</td>
</tr>
<tr>
<td valign="top" align="left">Provide an incentive for students to prepare for class.</td>
<td valign="top" align="left">We implemented LearningBits that (a) enable structured preparation for face-to-face sessions and (b) transparently reflect the learning outcomes in terms of constructive alignment.</td>
</tr>
<tr>
<td valign="top" align="left">Provide a mechanism to assess student understanding.</td>
<td valign="top" align="left">We implemented weekly quizzes via Moodle to provide students with feedback and to track their learning progress.</td>
</tr>
<tr>
<td valign="top" align="left">Feedback on individual or group works.</td>
<td valign="top" align="left">Individual feedback is given to all (groups of) students in either the face-to-face sessions or the online Helpdesk.</td>
</tr>
<tr>
<td valign="top" align="left">Provide enough time for Students to carry out the assignments.</td>
<td valign="top" align="left">The LearningBits can be worked through individually.</td>
</tr></tbody>
</table>
<table-wrap-foot>
<p>In this way, the students&#x00027; needs (for details see <xref ref-type="table" rid="T3">Table 3</xref>) as they were identified in the pre-study (see Section 3.2) were also taken into account.</p>
</table-wrap-foot>
</table-wrap>
<p>The students&#x00027; voiced expectations of the introductory physics education course above all refer to content aspects (for details see <xref ref-type="table" rid="T2">Table 2</xref>). Hence, to meet these students&#x00027; expectations we in particular ensure to allow for a transfer of theoretical foundations of physics education to school practice through different methods in the face-to-face settings such as analyzing and reflecting on specific cases from classroom practice (e.g., using communication protocols), implementing role plays or discussion tasks. In terms of content, the following topics are covered in the course: (1) Surface and deep structure of physics lessons, (2) Student conceptions and conceptual change, (3) Model of Educational Reconstruction, (4) The role of language in physics teaching, (5) Models in physics education, (6) Experiments in physics education, (7) Nature of Science in physics education, (8) The role of mathematics in physics education, (9) Interest and motivation, (10) Heterogeneity in physics classrooms, (11) Scientific Literacy and competence orientation, (12) Tasks in physics education, (13) Reflection of physics lessons, (14) Assessment. Advanced physics education courses offered as a part of the physics teacher education program at Leipzig University provide an opportunity for students to further develop their understanding beyond the fundamental concepts covered in the course presented here. Interested readers can get access to our course from the corresponding author.</p></sec></sec>
<sec id="s4">
<title>4. Research questions</title>
<p>In the context of accompanying evaluation of the flipped classroom physics education course presented in this article, the following research questions were investigated:</p>
<list list-type="order">
<list-item><p>To what extent can the students&#x00027; needs and expectations identified in Section 3.2 be met with the flipped classroom physics education course presented in this article (developed based on design criteria from the literature)?</p></list-item>
<list-item><p>How do students perceive the implemented flipped classroom concept in terms of&#x02026;</p>
<list list-type="simple">
<list-item><p>(a) &#x02026;organizational, affective or cognitive aspects of learning,</p></list-item>
<list-item><p>(b) &#x02026;the participation and support of the students, and</p></list-item>
<list-item><p>(c) &#x02026;the quality of the self-study materials?</p></list-item>
</list>
</list-item></list></sec>
<sec sec-type="methods" id="s5">
<title>5. Methods</title>
<sec>
<title>5.1. Study design and sample</title>
<p>The flipped classroom physics education course presented in this paper was implemented at Leipzig University in the winter term 2022/23. We conducted a questionnaire study at the end of the winter term to evaluate the course with a view to the research questions. The data collection took place in February 2023.</p>
<p>Participation in the study was voluntary. Out of the total 38 students who had registered for the course, 28 completed the questionnaire in its entirety while 29 started.</p>
</sec>
<sec>
<title>5.2. Instrument</title>
<p>The questionnaire consisted of different blocks, each addressing a different aspect of the research questions. The following paragraphs provide a brief overview of these blocks.</p>
<sec>
<title>5.2.1. Students&#x00027; needs and expectations</title>
<p>The pre-service physics teachers&#x00027; needs for and expectations of the introductory physics education course, which were identified in Section 3.2, were first summarized (i.e., categorized, for details see <xref ref-type="table" rid="T2">Tables 2</xref>, <xref ref-type="table" rid="T3">3</xref>) and then re-phrased as statements. In the first item battery, the students were then asked to rate their level of agreement with these statements on a rating scale ranging from 1 (corresponding to &#x0201C;strongly disagree&#x0201D;) to 4 (corresponding to &#x0201C;strongly agree&#x0201D;). The items are shown in <xref ref-type="table" rid="T5">Tables 5</xref>, <xref ref-type="table" rid="T6">6</xref> alongside a description of the answer patterns.</p>
<table-wrap position="float" id="T5">
<label>Table 5</label>
<caption><p>Students&#x00027; responses to the implementation of students&#x00027; needs as identified in the pre-study (see <xref ref-type="table" rid="T3">Table 3</xref>). The absolute frequencies for the occurrence of the rating options are given.</p></caption> 
<table frame="box" rules="all">
<thead>
<tr style="background-color:&#x00023;919498;color:&#x00023;ffffff">
<th valign="top" align="left"><bold>Item</bold></th>
<th valign="top" align="left"><bold>Strongly disagree</bold></th>
<th valign="top" align="left"><bold>Disagree</bold></th>
<th valign="top" align="left"><bold>Agree</bold></th>
<th valign="top" align="left"><bold>Strongly agree</bold></th>
<th valign="top" align="left"><bold>&#x003BC;</bold></th>
<th valign="top" align="left"><bold>&#x003C3;</bold></th>
</tr>
</thead>
<tbody>
<tr>
<td valign="top" align="left">In the face-to-face sessions, there is a good working atmosphere.</td>
<td valign="top" align="left">1</td>
<td valign="top" align="left">3</td>
<td valign="top" align="left">20</td>
<td valign="top" align="left">5</td>
<td valign="top" align="left">3.00</td>
<td valign="top" align="left">0.57</td>
</tr>
<tr>
<td valign="top" align="left">The workload fits well to the intended workload.</td>
<td valign="top" align="left">1</td>
<td valign="top" align="left">5</td>
<td valign="top" align="left">14</td>
<td valign="top" align="left">9</td>
<td valign="top" align="left">3.07</td>
<td valign="top" align="left">1.02</td>
</tr>
<tr>
<td valign="top" align="left">Timely contact with the module coordinators is ensured.</td>
<td valign="top" align="left">0</td>
<td valign="top" align="left">0</td>
<td valign="top" align="left">10</td>
<td valign="top" align="left">19</td>
<td valign="top" align="left">3.66</td>
<td valign="top" align="left">0.82</td>
</tr>
<tr>
<td valign="top" align="left">Sufficient materials or literature recommendations are offered for exam preparation.</td>
<td valign="top" align="left">0</td>
<td valign="top" align="left">4</td>
<td valign="top" align="left">12</td>
<td valign="top" align="left">13</td>
<td valign="top" align="left">3.31</td>
<td valign="top" align="left">0.78</td>
</tr>
<tr>
<td valign="top" align="left">The organization of the module is clear and transparent.</td>
<td valign="top" align="left">0</td>
<td valign="top" align="left">2</td>
<td valign="top" align="left">12</td>
<td valign="top" align="left">15</td>
<td valign="top" align="left">3.45</td>
<td valign="top" align="left">0.51</td>
</tr>
<tr>
<td valign="top" align="left">During in-person sessions, various methods and social forms for sustainable learning are implemented.</td>
<td valign="top" align="left">0</td>
<td valign="top" align="left">0</td>
<td valign="top" align="left">15</td>
<td valign="top" align="left">14</td>
<td valign="top" align="left">3.48</td>
<td valign="top" align="left">0.57</td>
</tr>
<tr>
<td valign="top" align="left">The exam expectations are transparent.</td>
<td valign="top" align="left">0</td>
<td valign="top" align="left">10</td>
<td valign="top" align="left">9</td>
<td valign="top" align="left">10</td>
<td valign="top" align="left">3.00</td>
<td valign="top" align="left">0.85</td>
</tr></tbody>
</table>
</table-wrap>
<table-wrap position="float" id="T6">
<label>Table 6</label>
<caption><p>Students&#x00027; responses to the fulfillment of students&#x00027; expectations as identified in the pre-study (see <xref ref-type="table" rid="T2">Table 2</xref>). The absolute frequencies for the occurrence of the rating options are given.</p></caption> 
<table frame="box" rules="all">
<thead>
<tr style="background-color:&#x00023;919498;color:&#x00023;ffffff">
<th valign="top" align="left"><bold>Item</bold></th>
<th valign="top" align="left"><bold>Strongly disagree</bold></th>
<th valign="top" align="left"><bold>Disagree</bold></th>
<th valign="top" align="left"><bold>Agree</bold></th>
<th valign="top" align="left"><bold>Strongly agree</bold></th>
<th valign="top" align="left"><bold>&#x003BC;</bold></th>
<th valign="top" align="left"><bold>&#x003C3;</bold></th>
</tr>
</thead>
<tbody>
<tr>
<td valign="top" align="left">The course contents are relevant to everyday school practice.</td>
<td valign="top" align="left">0</td>
<td valign="top" align="left">1</td>
<td valign="top" align="left">12</td>
<td valign="top" align="left">16</td>
<td valign="top" align="left">3.52</td>
<td valign="top" align="left">0.57</td>
</tr>
<tr>
<td valign="top" align="left">In the course, learning materials suitable for future teaching activities are created and reflected.</td>
<td valign="top" align="left">5</td>
<td valign="top" align="left">9</td>
<td valign="top" align="left">9</td>
<td valign="top" align="left">6</td>
<td valign="top" align="left">2.55</td>
<td valign="top" align="left">1.02</td>
</tr>
<tr>
<td valign="top" align="left">The course covers teaching sequences suitable for teaching different physics content areas in school.</td>
<td valign="top" align="left">0</td>
<td valign="top" align="left">8</td>
<td valign="top" align="left">10</td>
<td valign="top" align="left">11</td>
<td valign="top" align="left">3.10</td>
<td valign="top" align="left">0.82</td>
</tr>
<tr>
<td valign="top" align="left">In the course, theoretical content is applied in and reflected with regards to practical situations.</td>
<td valign="top" align="left">0</td>
<td valign="top" align="left">9</td>
<td valign="top" align="left">12</td>
<td valign="top" align="left">8</td>
<td valign="top" align="left">2.97</td>
<td valign="top" align="left">0.78</td>
</tr>
<tr>
<td valign="top" align="left">The course presents theories from the field of physics education research.</td>
<td valign="top" align="left">0</td>
<td valign="top" align="left">0</td>
<td valign="top" align="left">13</td>
<td valign="top" align="left">16</td>
<td valign="top" align="left">3.55</td>
<td valign="top" align="left">0.51</td>
</tr>
<tr>
<td valign="top" align="left">The course presents selected students&#x00027; learning difficulties in physics.</td>
<td valign="top" align="left">0</td>
<td valign="top" align="left">1</td>
<td valign="top" align="left">11</td>
<td valign="top" align="left">17</td>
<td valign="top" align="left">3.55</td>
<td valign="top" align="left">0.57</td>
</tr>
<tr>
<td valign="top" align="left">The course presents ways to motivate students&#x00027; for learning physics.</td>
<td valign="top" align="left">1</td>
<td valign="top" align="left">3</td>
<td valign="top" align="left">17</td>
<td valign="top" align="left">8</td>
<td valign="top" align="left">3.10</td>
<td valign="top" align="left">0.72</td>
</tr></tbody>
</table>
</table-wrap></sec>
<sec>
<title>5.2.2. Student perceptions of the flipped classroom course</title>
<p>We assessed the impact of our flipped course on student learning using 18 single-choice items (agree/disagree) adapted from a questionnaire developed in the INKULT project (ILI, <xref ref-type="bibr" rid="B34">2022</xref>). These items evaluated organizational, affective, and cognitive aspects of learning. The items are provided in <bold>Table 8</bold>. Cronbach&#x00027;s Alpha as an estimator of the internal consistency of the scale has been found to be &#x003B1; = 0.77 in our study.</p>
<p>In addition, we used rating-scale items (with a four-point scale where 1 corresponds to &#x0201C;strongly disagree&#x0201D; and 4 corresponds to &#x0201C;strongly agree&#x0201D;) which (a) have been developed and validated by Valero et al. (<xref ref-type="bibr" rid="B65">2019</xref>) and that (b) have been used in earlier studies on flipped classroom environments (e.g., see Ruslan et al., <xref ref-type="bibr" rid="B51">2022</xref>):</p>
<list list-type="bullet">
<list-item><p>Five items on affective and cognitive aspects of student learning. Cronbach&#x00027;s Alpha as an estimator of the internal consistency of the scale has been found to be &#x003B1; = 0.82 in our study. The items of the scale are given in <xref ref-type="table" rid="T7">Table 7</xref>.</p>
</list-item>
<list-item><p>Four items on student participation and support in the course. Cronbach&#x00027;s Alpha as an estimator of the internal consistency of the scale has been found to be &#x003B1; = 0.78 in our study. The items of the scale are given in <bold>Table 9</bold>.</p>
</list-item>
<list-item><p>Seven items on the quality of the self-study materials. Cronbach&#x00027;s Alpha as an estimator of the internal consistency of the scale has been found to be &#x003B1; = 0.82 in our study. The items of the scale are given in <bold>Table 10</bold>.</p>
</list-item>
</list>
<table-wrap position="float" id="T7">
<label>Table 7</label>
<caption><p>Students&#x00027; ratings regarding items on the impact of the flipped classroom physics education on affective and cognitive aspects of their learning. The absolute frequencies for the occurrence of the rating options are given.</p></caption> 
<table frame="box" rules="all">
<thead>
<tr style="background-color:&#x00023;919498;color:&#x00023;ffffff">
<th valign="top" align="left"><bold>Item</bold></th>
<th valign="top" align="left"><bold>Strongly disagree</bold></th>
<th valign="top" align="left"><bold>Disagree</bold></th>
<th valign="top" align="left"><bold>Agree</bold></th>
<th valign="top" align="left"><bold>Strongly agree</bold></th>
<th valign="top" align="left"><bold>&#x003BC;</bold></th>
<th valign="top" align="left"><bold>&#x003C3;</bold></th>
</tr>
</thead>
<tbody>
<tr>
<td valign="top" align="left">I always knew where I was and where the course was going.</td>
<td valign="top" align="left">0</td>
<td valign="top" align="left">1</td>
<td valign="top" align="left">14</td>
<td valign="top" align="left">13</td>
<td valign="top" align="left">3.43</td>
<td valign="top" align="left">0.56</td>
</tr>
<tr>
<td valign="top" align="left">This approach of teaching increased my motivation when studying this subject.</td>
<td valign="top" align="left">4</td>
<td valign="top" align="left">12</td>
<td valign="top" align="left">12</td>
<td valign="top" align="left">0</td>
<td valign="top" align="left">2.29</td>
<td valign="top" align="left">0.70</td>
</tr>
<tr>
<td valign="top" align="left">I found this approach intellectually challenging and stimulating.</td>
<td valign="top" align="left">2</td>
<td valign="top" align="left">11</td>
<td valign="top" align="left">11</td>
<td valign="top" align="left">4</td>
<td valign="top" align="left">2.61</td>
<td valign="top" align="left">0.82</td>
</tr>
<tr>
<td valign="top" align="left">My interest in this subject increased as a consequence of this learning method.</td>
<td valign="top" align="left">4</td>
<td valign="top" align="left">14</td>
<td valign="top" align="left">6</td>
<td valign="top" align="left">4</td>
<td valign="top" align="left">2.36</td>
<td valign="top" align="left">0.89</td>
</tr>
<tr>
<td valign="top" align="left">I have learned and understood the contents of the course using this approach.</td>
<td valign="top" align="left">3</td>
<td valign="top" align="left">7</td>
<td valign="top" align="left">17</td>
<td valign="top" align="left">1</td>
<td valign="top" align="left">2.57</td>
<td valign="top" align="left">0.73</td>
</tr>
<tr>
<td valign="top" align="left">Scale score</td>
<td/>
<td/>
<td/>
<td/>
<td valign="top" align="left">2.65</td>
<td valign="top" align="left">0.58</td>
</tr></tbody>
</table>
</table-wrap>
</sec></sec>
<sec>
<title>5.3. Data analysis</title>
<p>The responses of the students were initially analyzed using frequency analysis. As descriptive statistics, we report the mean value &#x003BC; and the standard deviation &#x003C3; for each item and for the scale scores. Diverging Stacked Bar Charts (Robbins and Heiberger, <xref ref-type="bibr" rid="B49">2011</xref>) summarize the results of evaluating each statement on a scale by displaying a normalized bar aligned relative to the center of the scale. The percentage of participants who (rather) agree with a statement is shown on the right side of the scale, while the percentage of study participants who (rather) disagree with a statement is read on the left side of the scale. A shift of the entire bar to the right indicates a tendency toward agreement of the respondents to a given statement, while a shift to the left indicates a tendency toward disagreement.</p></sec></sec>
<sec sec-type="results" id="s6">
<title>6. Results</title>
<sec>
<title>6.1. Results regarding research question 1: students&#x00027; needs and expectations</title>
<sec>
<title>6.1.1. Are students&#x00027; needs met?</title>
<p><xref ref-type="table" rid="T5">Table 5</xref> presents the results of a survey conducted among students to measure the implementation of their identified needs. Looking at the mean scores for each item, it seems that students generally had a positive response to the implementation of their identified needs in the pre-study. The highest mean scores were for timely contact with module coordinators, implementation of various methods for sustainable learning during in-person sessions, and clear organization of the module. However, there were also some areas for improvement, such as providing sufficient materials or literature recommendations for exam preparation and making exam expectations more transparent.</p>
<p>It is noteworthy that the standard deviations for the mean scores were generally low, indicating that the responses were relatively consistent across the student population. However, there were a few items (e.g., &#x0201C;The workload fits well to the intended workload&#x0201D;) where some students (strongly) disagreed while others agreed (completely), suggesting that this aspect of the module may be more polarizing among students.</p></sec>
<sec>
<title>6.1.2. Are students&#x00027; expectations met?</title>
<p>The results in the <xref ref-type="table" rid="T6">Table 6</xref> show that the students were mostly satisfied with the course in terms of meeting their expectations. The items related to presenting theories from the field of physics education research, presenting selected students&#x00027; learning difficulties in physics, and the on course contents being relevant to everyday school practice received the highest levels of agreement, with means above 3.5 on a 4-point rating scale. The items related to creating and reflecting on teaching materials, covering teaching sequences for different physics content areas, and applying theoretical content in practical situations received lower levels of agreement, but still had means above 2.5.</p>
</sec></sec>
<sec>
<title>6.2. Results regarding research question 2: student perceptions of the flipped classroom course</title>
<sec>
<title>6.2.1. Results regarding research question 2a: impact on organizational, affective, and cognitive aspects of learning</title>
<p><xref ref-type="table" rid="T7">Table 7</xref> presents students&#x00027; ratings regarding the impact of the flipped classroom approach on affective and cognitive aspects of their learning. The results suggest that, on average, students agreed or strongly agreed with the statements that the flipped classroom approach helped them to learn and understand the course content (&#x003BC; = 2.57, &#x003C3; = 0.73) and found the approach intellectually challenging and stimulating (&#x003BC; = 2.61, &#x003C3; = 0.82). However, the results also indicate that, on average, students were slightly less enthusiastic about the impact of the flipped classroom on their motivation and interest in the subject, with mean ratings of 2.29 (&#x003C3; = 0.70) and 2.36 (&#x003C3; = 0.89), respectively. A graphical overview of these results is provided in <xref ref-type="fig" rid="F1">Figure 1</xref>.</p>
<fig id="F1" position="float">
<label>Figure 1</label>
<caption><p>Diverging Stacked Bar Chart on students&#x00027; ratings regarding items on affective and cognitive aspects of their learning experience.</p></caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="feduc-08-1194963-g0001.tif"/>
</fig>
<p>The results presented in <xref ref-type="table" rid="T8">Table 8</xref> shed some more light on the student perceptions: Again, the majority of the students agreed that the flipped classroom approach helped them to prepare for synchronous face-to-face sessions (15 agree vs. 14 disagree), work on the course content at their own pace (14 agree vs. 15 disagree), and know what to expect in the exam (14 agree vs. 15 disagree) as is shown in <xref ref-type="table" rid="T8">Table 8</xref>. However, there were several areas where the students did not find the flipped classroom approach to be particularly helpful. For example, a majority of the students disagreed that the flipped classroom approach helped them to structure their learning (3 agree vs. 26 disagree), stay continuously motivated throughout the semester (3 agree vs. 26 disagree), and receive additional support for their studies (5 agree vs. 24 disagree).</p>
<table-wrap position="float" id="T8">
<label>Table 8</label>
<caption><p>Student perceptions of organizational, affective, and cognitive aspects of the flipped classroom physics education course under investigation. The absolute frequencies for the occurrence of the rating options are given.</p></caption> 
<table frame="box" rules="all">
<thead>
<tr style="background-color:&#x00023;919498;color:&#x00023;ffffff">
<th valign="top" align="left"><bold>The Flipped Classroom concept helps me to..</bold>.</th>
<th valign="top" align="left"><bold>Agree</bold></th>
<th valign="top" align="left"><bold>Disagree</bold></th>
</tr>
</thead>
<tbody>
<tr>
<td valign="top" align="left">&#x02026;prepare for the synchronous face-to-face session.</td>
<td valign="top" align="left">15</td>
<td valign="top" align="left">14</td>
</tr>
<tr>
<td valign="top" align="left">&#x02026;better understand the course content.</td>
<td valign="top" align="left">9</td>
<td valign="top" align="left">20</td>
</tr>
<tr>
<td valign="top" align="left">&#x02026;repeat the contents of the course specifically.</td>
<td valign="top" align="left">9</td>
<td valign="top" align="left">20</td>
</tr>
<tr>
<td valign="top" align="left">&#x02026;work on the contents of the course at my own pace.</td>
<td valign="top" align="left">14</td>
<td valign="top" align="left">15</td>
</tr>
<tr>
<td valign="top" align="left">&#x02026;make my learning flexible in terms of spatial and temporal dimensions.</td>
<td valign="top" align="left">9</td>
<td valign="top" align="left">20</td>
</tr>
<tr>
<td valign="top" align="left">&#x02026;structure my learning.</td>
<td valign="top" align="left">3</td>
<td valign="top" align="left">26</td>
</tr>
<tr>
<td valign="top" align="left">&#x02026;refresh my previous knowledge.</td>
<td valign="top" align="left">4</td>
<td valign="top" align="left">25</td>
</tr>
<tr>
<td valign="top" align="left">&#x02026;better apply the course content.</td>
<td valign="top" align="left">8</td>
<td valign="top" align="left">21</td>
</tr>
<tr>
<td valign="top" align="left">&#x02026;deepen my learning.</td>
<td valign="top" align="left">12</td>
<td valign="top" align="left">17</td>
</tr>
<tr>
<td valign="top" align="left">&#x02026;learn in a more self-directed way.</td>
<td valign="top" align="left">9</td>
<td valign="top" align="left">20</td>
</tr>
<tr>
<td valign="top" align="left">&#x02026;improve my self-learning skills.</td>
<td valign="top" align="left">4</td>
<td valign="top" align="left">25</td>
</tr>
<tr>
<td valign="top" align="left">&#x02026;prepare for the exam.</td>
<td valign="top" align="left">13</td>
<td valign="top" align="left">16</td>
</tr>
<tr>
<td valign="top" align="left">&#x02026;know what to expect in the exam.</td>
<td valign="top" align="left">14</td>
<td valign="top" align="left">15</td>
</tr>
<tr>
<td valign="top" align="left">&#x02026;come into personal exchange with my instructor.</td>
<td valign="top" align="left">9</td>
<td valign="top" align="left">20</td>
</tr>
<tr>
<td valign="top" align="left">&#x02026;come into personal exchange with my fellow students.</td>
<td valign="top" align="left">11</td>
<td valign="top" align="left">18</td>
</tr>
<tr>
<td valign="top" align="left">&#x02026;stay continuously motivated throughout the semester.</td>
<td valign="top" align="left">3</td>
<td valign="top" align="left">26</td>
</tr>
<tr>
<td valign="top" align="left">&#x02026;combine the advantages of online and face-to-face learning.</td>
<td valign="top" align="left">7</td>
<td valign="top" align="left">22</td>
</tr>
<tr>
<td valign="top" align="left">&#x02026;receive additional support for my studies.</td>
<td valign="top" align="left">5</td>
<td valign="top" align="left">24</td>
</tr></tbody>
</table>
</table-wrap>
</sec>
<sec>
<title>6.2.2. Results regarding research question 2b: student participation and support</title>
<p><xref ref-type="table" rid="T9">Table 9</xref> provides the results of the items in which students were asked to rate their agreement with four statements related to their involvement and participation in face-to-face sessions as well as the perceived support. The results indicate that the majority of students agreed that they were encouraged to participate in class discussions, share their ideas and knowledge, express their own ideas and question the instructor. The mean scores for these items were high, ranging from 3.43 to 3.61, with standard deviations ranging from 0.49 to 0.68. These findings suggest that the students generally perceived a high level of encouragement and support for their participation in the flipped classroom concept under investigation. A graphical overview of these results is provided in <xref ref-type="fig" rid="F2">Figure 2</xref>.</p>
<table-wrap position="float" id="T9">
<label>Table 9</label>
<caption><p>Student perceptions of the impact of the flipped classroom physics education course presented in this article on learner participation and support. The absolute frequencies for the occurrence of the rating options are given.</p></caption> 
<table frame="box" rules="all">
<thead>
<tr style="background-color:&#x00023;919498;color:&#x00023;ffffff">
<th valign="top" align="left"><bold>Item</bold></th>
<th valign="top" align="left"><bold>Strongly disagree</bold></th>
<th valign="top" align="left"><bold>Disagree</bold></th>
<th valign="top" align="left"><bold>Agree</bold></th>
<th valign="top" align="left"><bold>Strongly agree</bold></th>
<th valign="top" align="left"><bold>&#x003BC;</bold></th>
<th valign="top" align="left"><bold>&#x003C3;</bold></th>
</tr>
</thead>
<tbody>
<tr>
<td valign="top" align="left">Students were encouraged to participate in class discussions.</td>
<td valign="top" align="left">0</td>
<td valign="top" align="left">2</td>
<td valign="top" align="left">9</td>
<td valign="top" align="left">17</td>
<td valign="top" align="left">3.54</td>
<td valign="top" align="left">0.63</td>
</tr>
<tr>
<td valign="top" align="left">Students were invited to share their ideas and knowledge.</td>
<td valign="top" align="left">0</td>
<td valign="top" align="left">0</td>
<td valign="top" align="left">11</td>
<td valign="top" align="left">17</td>
<td valign="top" align="left">3.61</td>
<td valign="top" align="left">0.49</td>
</tr>
<tr>
<td valign="top" align="left">Students were encouraged to ask questions and were given satisfactory answers.</td>
<td valign="top" align="left">0</td>
<td valign="top" align="left">3</td>
<td valign="top" align="left">10</td>
<td valign="top" align="left">15</td>
<td valign="top" align="left">3.43</td>
<td valign="top" align="left">0.68</td>
</tr>
<tr>
<td valign="top" align="left">Students were encouraged to express their own ideas and question the instructor.</td>
<td valign="top" align="left">0</td>
<td valign="top" align="left">3</td>
<td valign="top" align="left">10</td>
<td valign="top" align="left">15</td>
<td valign="top" align="left">3.43</td>
<td valign="top" align="left">0.68</td>
</tr>
<tr>
<td valign="top" align="left">Scale score</td>
<td/>
<td/>
<td/>
<td/>
<td valign="top" align="left">3.52</td>
<td valign="top" align="left">0.49</td>
</tr></tbody>
</table>
</table-wrap>
<fig id="F2" position="float">
<label>Figure 2</label>
<caption><p>Diverging Stacked Bar Chart on students&#x00027; ratings regarding items on the impact of the flipped classroom physics education course presented in this article on learner participation and support.</p></caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="feduc-08-1194963-g0002.tif"/>
</fig>
</sec>
<sec>
<title>6.2.3. Results regarding research question 2c: quality of learning materials</title>
<p>We gathered students&#x00027; perceptions of the learning materials used in the self-study phase of the course. The results (see <xref ref-type="table" rid="T10">Table 10</xref>) indicated that the majority of students found the materials to be helpful in preparing for face-to-face sessions and were able to comprehend the content through watching videos or reading texts prior to class. Despite the self-reported value of the self-study materials, some students reported that they did not have enough time to view the videos&#x02014;which seems surprising since the majority of the students stated that the time for preparation was appropriate. This finding may have implications for educators and instructional designers who are considering implementing a flipped classroom approach, as they may need to provide additional guidance on time management strategies to optimize the effectiveness of self-study materials. A graphical overview of these results is provided in <xref ref-type="fig" rid="F3">Figure 3</xref>.</p>
<table-wrap position="float" id="T10">
<label>Table 10</label>
<caption><p>Student assessment of the quality of the learning materials provided for the self-study phase. The absolute frequencies for the occurrence of the rating options are given.</p></caption> 
<table frame="box" rules="all">
<thead>
<tr style="background-color:&#x00023;919498;color:&#x00023;ffffff">
<th valign="top" align="left"><bold>Item</bold></th>
<th valign="top" align="left"><bold>Strongly disagree</bold></th>
<th valign="top" align="left"><bold>Disagree</bold></th>
<th valign="top" align="left"><bold>Agree</bold></th>
<th valign="top" align="left"><bold>Strongly agree</bold></th>
<th valign="top" align="left"><bold>&#x003BC;</bold></th>
<th valign="top" align="left"><bold>&#x003C3;</bold></th>
</tr>
</thead>
<tbody>
<tr>
<td valign="top" align="left">I find the video very helpful for my understanding prior to the class.</td>
<td valign="top" align="left">1</td>
<td valign="top" align="left">1</td>
<td valign="top" align="left">15</td>
<td valign="top" align="left">11</td>
<td valign="top" align="left">3.29</td>
<td valign="top" align="left">0.70</td>
</tr>
<tr>
<td valign="top" align="left">The pre-recorded video assists me in preparing for the class.</td>
<td valign="top" align="left">1</td>
<td valign="top" align="left">2</td>
<td valign="top" align="left">15</td>
<td valign="top" align="left">10</td>
<td valign="top" align="left">3.21</td>
<td valign="top" align="left">0.72</td>
</tr>
<tr>
<td valign="top" align="left">I had adequate time to view the videos and lessons before the FC activity.</td>
<td valign="top" align="left">0</td>
<td valign="top" align="left">5</td>
<td valign="top" align="left">9</td>
<td valign="top" align="left">14</td>
<td valign="top" align="left">3.32</td>
<td valign="top" align="left">0.76</td>
</tr>
<tr>
<td valign="top" align="left">The discussion and activity in the class are easy to follow and enhanced my understanding of the material given.</td>
<td valign="top" align="left">3</td>
<td valign="top" align="left">2</td>
<td valign="top" align="left">15</td>
<td valign="top" align="left">8</td>
<td valign="top" align="left">3.00</td>
<td valign="top" align="left">0.89</td>
</tr>
<tr>
<td valign="top" align="left">Video contents were well-structured.</td>
<td valign="top" align="left">1</td>
<td valign="top" align="left">2</td>
<td valign="top" align="left">13</td>
<td valign="top" align="left">12</td>
<td valign="top" align="left">3.29</td>
<td valign="top" align="left">0.75</td>
</tr>
<tr>
<td valign="top" align="left">Explanations given in the videos were clear and easy to understand.</td>
<td valign="top" align="left">1</td>
<td valign="top" align="left">3</td>
<td valign="top" align="left">15</td>
<td valign="top" align="left">9</td>
<td valign="top" align="left">3.14</td>
<td valign="top" align="left">0.74</td>
</tr>
<tr>
<td valign="top" align="left">I can join in the discussion in the classroom because I have completed my task before the in synchronous session.</td>
<td valign="top" align="left">4</td>
<td valign="top" align="left">6</td>
<td valign="top" align="left">12</td>
<td valign="top" align="left">6</td>
<td valign="top" align="left">2.71</td>
<td valign="top" align="left">0.96</td>
</tr>
<tr>
<td valign="top" align="left">Scale score</td>
<td/>
<td/>
<td/>
<td/>
<td valign="top" align="left">3.14</td>
<td valign="top" align="left">0.56</td>
</tr></tbody>
</table>
</table-wrap>
<fig id="F3" position="float">
<label>Figure 3</label>
<caption><p>Diverging Stacked Bar Chart on students&#x00027; ratings regarding items on the quality of the learning materials provided for the self-study phase.</p></caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="feduc-08-1194963-g0003.tif"/>
</fig></sec></sec></sec>
<sec sec-type="discussion" id="s7">
<title>7. Discussion</title>
<p>The implementation of flipped classroom approaches has gained increasing attention in recent years, particularly in the field of education. In this study, we aimed to design a flipped classroom concept that could enhance physics teacher education, taking into consideration relevant literature and the needs and expectations of students. Our research focused on the empirical evaluation of the developed flipped classroom approach, providing insights into its strengths and weaknesses. The findings of our study have important implications for the use of flipped classroom scenarios in physics teacher education, and point toward further avenues of research in this area.</p>
<p>The evaluation of our flipped classroom physics education course yielded several findings that are consistent with previous research (cf. Doo, <xref ref-type="bibr" rid="B16">2021</xref>; Aidoo et al., <xref ref-type="bibr" rid="B3">2022b</xref>): Out of the 29 students participating in our questionnaire study at the end of course implementation&#x02026;</p>
<list list-type="bullet">
<list-item><p>&#x02026;15 students state that the flipped approach is useful for the preparation of face-to-face discussions. This aligns with the conclusions of Alvarez (<xref ref-type="bibr" rid="B4">2012</xref>) and Fulton (<xref ref-type="bibr" rid="B25">2012</xref>).</p></list-item>
<list-item><p>&#x02026;9 students report that the flipped classroom helps to organize their learning independent from spatial and temporal boundary conditions, which was also shown by O&#x00027;Flaherty and Phillips (<xref ref-type="bibr" rid="B46">2015</xref>). Similarly, 14 students state that our flipped classroom approach allows them to elaborate on the course contents in their own pace which has already been found for flipped classroom concepts in different contexts before (e.g., see Nouri, <xref ref-type="bibr" rid="B45">2016</xref>; Zainuddin and Halili, <xref ref-type="bibr" rid="B68">2016</xref>). In contrast, however, only three of our study participants state that the flipped classroom concept would have had an impact on organizing one&#x00027;s own learning process. We argue that this might be due to difficulties in students&#x00027; self-regulation and self-instruction which is in parallel with earlier findings published by Hwang et al. (<xref ref-type="bibr" rid="B32">2015</xref>) or Hypp&#x000F6;nen et al. (<xref ref-type="bibr" rid="B33">2019</xref>).</p></list-item>
<list-item><p>&#x02026;13 students state that the flipped classroom helps with exam preparation and 14 students stated that the approach was useful in becoming familiar with the exam requirements. This agrees with earlier studies, such as by Gross et al. (<xref ref-type="bibr" rid="B29">2015</xref>) or O&#x00027;Flaherty and Phillips (<xref ref-type="bibr" rid="B46">2015</xref>), which showed that students in flipped environments might outperform students who had participated in traditional instruction before.</p></list-item>
<list-item><p>&#x02026;11 students attest that the flipped environment would benefit the building of learning communities which is considered a relevant aspect of flipped classroom scenarios (Kim et al., <xref ref-type="bibr" rid="B35">2014</xref>).</p></list-item>
</list>
<p>Taken together, this study&#x02014;in the context in a physics education course as part of physics teacher education&#x02014;underpins earlier findings according to which the flipped classroom may have a positive influence on students&#x00027; learning behavior and (self-reported) performance. However, the study also reveals that some students may prefer a traditional lecture with fewer self-activities during face-to-face events (see in particular students&#x00027; ratings in <xref ref-type="table" rid="T8">Table 8</xref>). From the results of this study, we propose three key recommendations that instructors or trainers may want to consider when developing a flipped classroom scenario:</p>
<list list-type="order">
<list-item><p>We recommend that the development of flipped classroom concepts be based on well-defined design principles (form the literature) from the very beginning. In this study, we followed (Kim et al., <xref ref-type="bibr" rid="B35">2014</xref>) to ensure that the various quality criteria were taken into account in the development of our physics education course. In addition, we have shown how the inclusion of student needs and expectations can be realized with little additional effort. We believe that the latter might contribute to increase the students&#x00027; sense of being involved into to course progress. The results from <xref ref-type="table" rid="T9">Table 9</xref> on learners&#x00027; participation and support underline this hypothesis, but of course do not allow us to draw causal conclusions.</p></list-item>
<list-item><p>In addition, we suggest focusing on an clear connection between (potential) video content in the self-study phase and the tasks provided in-class activities to improve the students&#x00027; learning experience. In our case, a lack of such a clear connection between self-study phase and face-to-face scenario was identified as a striking obstacle for learners (see Section 6.2.3).</p></list-item>
<list-item><p>Lastly, we recommend educators and instructors to provide guidance on time management strategies in flipped classroom scenarios in order to optimize their effectiveness (see results in Section 6.2.3). Similarly, earlier research underlines that this &#x0201C;might be even more important in a flipped classroom since self-regulation skills and self-discipline become more important than traditional lectures&#x0201D; (Nielsen, <xref ref-type="bibr" rid="B44">2023</xref>, p. 15).</p></list-item>
</list>
<p>We believe the above recommendations might be valuable whenever it comes to developing a flipped classroom environment, even though this study analyzes a specific physics education course as part of physics teacher education. We address the limitations of this research in Section 8.1.</p></sec>
<sec id="s8">
<title>8. Limitations and outlook</title>
<sec>
<title>8.1. Limitations</title>
<p>The findings presented in this article can inform the design and development of future flipped classroom courses to better meet the needs and expectations of students (see recommendations provided in Section 7). However, it is important to note that the study was conducted in the context of a physics education course, and further research is needed to determine the generalizability of these findings to other subjects and disciplines. Additionally, future research could explore the specific teaching strategies that instructors can use to foster student participation and support in the flipped classroom in general, and with regards to physics education courses in particular.</p>
<p>It is worth noting that while the sample size in this study is relatively small, the data provides useful insights into how students perceive the course and how it could be improved in the future. To generalize these findings to a larger population, further research with larger sample sizes is needed. Additionally, it may be helpful to gather qualitative data, for example from interviews or focus group discussions, to gain a deeper understanding of students&#x00027; perspectives.</p>
</sec>
<sec>
<title>8.2. Outlook</title>
<p>To prepare future physics teachers for the challenges of teaching, a comprehensive didactic education in physics, closely connected with high-quality subject-specific training, is essential. Enriched learning, which includes reflection on experiences, particularly those related to teaching practice, is likely to be beneficial for students&#x00027; professional development. Studies have shown that promoting professional competencies in courses using a flipped classroom approach might be more favorable than traditional teaching formats since the flipped classroom&#x00027;s internal organizational structure creates a concrete link between knowledge acquisition, application, and transfer (Abeysekera and Dawson, <xref ref-type="bibr" rid="B1">2015</xref>).</p>
<p>Therefore, we developed and evaluated a flipped classroom physics education course that serves as an introductory course in physics didactics for prospective physics teachers in their fifth semester of study at the University of Leipzig. Currently, we are establishing a teaching-learning laboratory at the University of Leipzig, called DigiSpace, to provide students with the opportunity to apply their knowledge of physics didactics under conditions of reduced complexity in a protected framework for planning shorter teaching sequences: The DigiSpace mainly focuses on teaching and learning physics with the help of digital tools (<ext-link ext-link-type="uri" xlink:href="https://www.physgeo.uni-leipzig.de/dip/digi-space">https://www.physgeo.uni-leipzig.de/dip/digi-space</ext-link>). In an advanced physics education course based on the flipped classroom course presented in this article, students will design an explanatory sequence on a certain physics topic using a selected digital tool for a given target group. They will test this explanatory sequence through microteaching directly in the DigiSpace. The DigiSpace&#x00027;s equipment (e.g., a 360&#x000B0; camera), allows for subsequent reflection on the explanatory sequence and the pre-service teacher&#x00027;s actions. By doing so, the contents of the introductory physics education course presented in this article are taken up, and will be even more strongly connected to the teaching practice of the prospective physics teachers. In the future, we will report on the results of the evaluation of courses in the DigiSpace.</p></sec></sec>
<sec sec-type="data-availability" id="s9">
<title>Data availability statement</title>
<p>The raw data supporting the conclusions of this article will be made available by the authors, without undue reservation.</p></sec>
<sec sec-type="ethics-statement" id="s10">
<title>Ethics statement</title>
<p>Ethical review and approval was not required for the study on human participants in accordance with the local legislation and institutional requirements. The patients/participants provided their written informed consent to participate in this study.</p></sec>
<sec sec-type="author-contributions" id="s11">
<title>Author contributions</title>
<p>PB: conceptualization, methodology, investigation, data curation, writing&#x02014;original draft, writing&#x02013;review and editing, and supervision. FH: formal analysis, writing&#x02014;original draft, and writing&#x02013;review and editing. All authors contributed to the article and approved the submitted version.</p></sec>
</body>
<back>
<sec sec-type="funding-information" id="s12">
<title>Funding</title>
<p>The authors acknowledge support from the German Research Foundation (DFG) and Universit&#x000E4;t Leipzig within the program of Open Access Publishing.</p>
</sec>
<sec sec-type="COI-statement" id="conf1">
<title>Conflict of interest</title>
<p>The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.</p>
</sec>
<sec sec-type="disclaimer" id="s13">
<title>Publisher&#x00027;s note</title>
<p>All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.</p>
</sec>
<ref-list>
<title>References</title>
<ref id="B1">
<citation citation-type="journal"><person-group person-group-type="author"><name><surname>Abeysekera</surname> <given-names>L.</given-names></name> <name><surname>Dawson</surname> <given-names>P.</given-names></name></person-group> (<year>2015</year>). <article-title>Motivation and cognitive load in the flipped classroom: definition, rationale and a call for research</article-title>. <source>Higher Educ. Res. Dev.</source> <volume>34</volume>, <fpage>1</fpage>&#x02013;<lpage>14</lpage>. <pub-id pub-id-type="doi">10.1080/07294360.2014.934336</pub-id></citation>
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