Beyond Translation: Caregiver Collaboration in Adapting an Early Language Intervention

Spanish-speaking families in the United States must often overcome multiple challenges to support their young children’s early language development (e.g., language and cultural barriers, financial stress, limited learning resources, etc.). These challenges highlight the need for early language interventions tailored to the needs of Spanish-speaking families and developed in collaboration with them. For diverse populations, early language interventions which are both translated into the relevant language and culturally responsive are the most effective for improving child outcomes. However, few interventions meet both criteria, demonstrating a need for materials that are accessible across both language and culture. The current study describes the five-phase process of creating a linguistically and culturally relevant Spanish adaptation of Duet, an early language intervention. The adaptation of the Duet intervention modules involved multiple language experts, including Spanish-speaking developmental psychologists, a translation company, and Spanish-speaking caregivers of infants and toddlers. Fourteen caregivers were recruited to participate in two, 3-h focus groups. Input from caregivers was a particularly important step in the adaptation process, as caregivers hold knowledge about everyday experiences with their children. Through this process, the authors aim to shed light onto the importance of collaborating with the community and present a possible framework for others who are adapting interventions.


INTRODUCTION
There is an urgent need to address issues of equity and diversity in research. Part of this process requires including more diverse populations to match the cultural, linguistic, racial, and ethnic heterogeneity in the United States (Roberts et al., 2020). Ethnic minority families adopt culturespecific parenting beliefs and engage in learning activities adapted to their ecological context (Melzi et al., 2019;Sperry et al., 2019). However, their unique strengths are often overlooked in the educational system and early interventions (Janes and Kermani, 2001), which frequently employ a "one-size-fits-all" mindset instead of using a within-group framework to develop family centered culturally responsive interventions that meet community needs (Melzi et al., 2019).
Yet the effective implementation of culturally responsive interventions is a challenge in the current education context. Education researchers strive for a system that values a whole child approach (Diamond, 2010;Darling-Hammond et al., 2020). However, the reality is that the current education system values a set of skills (i.e., language, literacy, math) that are important for children to gain in their own right, but narrowly construed under the pressure of high-stakes assessments (Berliner, 2011). Though specific goals may vary, and parents may have additional culturally specific goals (e.g., "bien educados"-or respectful, well-mannered children)-most parents across SES and cultural backgrounds in the United.States, want their children to do well in school to have better long-term career choices (Zeehandelaar and Winkler, 2013;Valant and Newark, 2017). A preponderance of research further demonstrates that early language skills are the best long-term predictors of later academic success (Bleses et al., 2016;Golinkoff et al., 2019;Pace et al., 2019). While there is much within-group variation, on average, children from under-resourced environments have lower-quality language interactions than their moderate-and higher-resourced peers (Huttenlocher et al., 2010;Golinkoff et al., 2019;Sperry et al., 2019). More specifically, children in Spanish-speaking households are disproportionately more likely to live in under-resourced homes, and thereby experience increased risk to their language development (Child Trends Databank, 2021; National Center for Children in Poverty, 2018) and later academic achievement (Reardon and Galindo, 2009). Thus, making it important for researchers to collaborate with within-group caregivers to determine the best ways to support early language development. The current study was designed to address the need for culturally responsive interventions within the larger educational context. It expands on Duet, a preventative early language intervention for caregivers from under-resourced environments. This study describes the steps taken to adapt Duet, originally available only in English, for use with predominantly Spanish-speaking caregivers.
When children engage in more frequent and higher-quality language interactions with caregivers they demonstrate better long-term academic outcomes (Storch and Whitehurst, 2002;Huttenlocher et al., 2010;Hirsh-Pasek et al., 2015;Pace et al., 2019). Although many studies focus on English-speaking families (Hirsh-Pasek et al., 2015;Masek et al., 2021), high-quality, early language interactions also support the communication skills of children from other cultural and linguistic backgrounds. Studies investigating Spanish-speaking mothers' use of more complex, elaborative language, found that it promoted children's narrative skills Tamis-LeMonda et al., 2014;Hammer and Sawyer, 2016;Escobar et al., 2017). Additionally, more frequent backand-forth conversations in caregiver-child dyads predicted language development in Spanish-speaking children . Despite the importance of early communication experiences across backgrounds, questions remain, including: "How do researchers help caregivers create an environment with rich, high-quality early interactions?" and "How do researchers develop intervention materials that are linguistically and culturally responsive?" Many caregiver-focused, English-language interventions have been developed in the United States (Roberts and Kaiser, 2011;Greenwood et al., 2020;Heidlage et al., 2020). However, few interventions are responsive to bilingual learners (Cycyk et al., 2020;Durán et al., 2016;Larson et al., 2020). Caregiverimplemented naturalistic communication interventions (CI-NCIs) aim to improve interactions that occur between caregivers and children in daily routines. CI-NCIs have been shown to improve children's language outcomes (Cycyk et al., 2020;Heidlage et al., 2020;Roberts and Kaiser, 2011). One metaanalysis found that CI-NCIs targeting play and routine interactions improved children's expressive vocabulary with larger effect sizes than interventions targeting only shared reading (i.e., g 0.50 vs. g 0.37) (Heidlage et al., 2020). In a recent review, Larson and colleagues (2020) found that interventions that were linguistically and culturally responsive were most effective at improving children's language skills. Presenting materials in the participants' native language rendered them linguistically responsive by demonstrating respect and support for children's communication skills. Similarly, culturally responsive interventions drew on participants' values, beliefs, practices, and experiences as resources (Larson et al., 2020). When caregivers deem intervention strategies to be socially important, they are more likely to implement them with their children (Janes and Kermani, 2001;Dunst et al., 2016;Hammer and Sawyer, 2016;Melzi et al., 2019). Examples of successful, strengths-based interventions included using children's drawings to spark conversations between children and parents (Ceasar and Nelson, 2014) and using food as a central theme for language and literacy activities (Levya and Skorb, 2017). These interventions also sought to support children's growth towards cultural goals held by caregivers and to maintain their ethnic identities while acquiring language and literacy skills needed for success in school (Melzi et al., 2019). Despite the importance of cultural and linguistic adaptation, few studies meet both criteria (Larson et al., 2020). To date, one study met both criteria and was a CI-NCI. However, it was targeted towards caregivers of preschoolers (Cycyk et al., 2020), demonstrating a need for linguistically and culturally responsive CI-NCIs that seek to support the youngest learners. To the authors' knowledge, this is the first study to linguistically and culturally adapt a CI-NCI for use with Spanishspeaking caregivers of infants and toddlers.
Although there is a clear need for linguistically and culturally responsive early language interventions, there is no set standard for adapting intervention materials. While models exist, guidelines are broad and flexible, resulting in varied levels of adaptation (Bernal et al., 1995;Rodriguez et al., 201l;Sangraula et al., 2020;Stirman et al., 2019). One relevant model is the Cultural Adaptation Process (CAP; Domenech Rodriguez and Wieling, 2005;Rodriguez et al., 2011). CAP has three phases which emphasize stakeholder collaboration, creating and testing an initial cultural adaptation, and revising the adaptation based on feedback. The CAP was intended to be used with the Ecological Validity Model (EVM; Bernal et al., 1995) which contains eight specific areas for consideration when adapting interventions for use with Hispanic families (see Table 1). Both models demonstrate the importance of involving the target population in the development, testing the materials with the Phase 1: Initial translation of content The English duet modules were translated into Spanish by a member of the duet team who is a native Spanish speaker. Two other Spanish-speaking duet team members independently reviewed and made edits to the initial translation. All three duet team translators came together as a group to reach consensus on the edits and create the initial duet team translation The initial duet team translation was then sent to a translation company. The translation company used the initial duet team translation (in Spanish) to create a back translation (in English). The company also used the original duet modules (in English) to create a second forward translation (in Spanish) The duet team reviewed all three translations: 1) the initial duet team translation, 2) the translation company's back translation in English, and 3) the translation company's forward translation in Spanish. Then the duet team created a version of the translation to share with the focus groups Collaboration between intervention developer and cultural adaptation specialist/s (Phase 1) Language-Translation of the intervention The duet team reviewed feedback from caregivers during the focus groups and revised modules. The duet team also added videos of Spanish-speaking caregivers interacting with their children into the adapted modules Team tailors the intervention to the target population a priori (Phase 2) Phase 4: Pilot esting The modules are currently being pilot tested with predominately Spanish-speaking caregivers of infants and toddlers and English-speaking control group caregivers Spanish-speaking caregivers will be matched with native Spanish-speaking interventionists. Caregivers' comfort with interventionists will also be measured with the coach-caregiver relationship inventory, adapted from the nurse-client relationship inventory Barnard (1998) Persons -matching participants to personnel who match their culture The intervention will be evaluated by measuring whether there are differences in caregiver knowledge about language development, the quality of caregiver-child interactions, and children's language outcomes Goals-Ensuring the goals of the study align with positive cultural values Caregivers will be scheduled for three 2-3 h calls at baseline, 3-months and 6-months. After baseline data collection participants in the intervention will also have weekly calls with an interventionist over the course of 7 weeks. Data collection and intervention calls will be scheduled flexibly with caregivers around their schedules. Data collection calls can be broken up (e.g., two 1.5-h calls) and participants will be paired with an interventionist whose language and availability matches theirs. Throughout the intervention, interventionists will attend regular meetings with the research team to discuss progress with caregivers or identify needs for cultural and linguistic adaptations that did not arise in the focus groups Team assess in field progress and makes adaptations/test and revise measures (Phase 2) Context-Continually making sure that the adaptation meets the needs of the target population throughout the study Measures and methods used in the study are appropriate for use with the target population. For example, if children in the study are exposed to English and Spanish, then they will receive the age-appropriate forms of the MBCDI in English and Spanish to account for their combined vocabulary Fenson et al. (2000), Jackson-Maldonado et al. (2013) Identification of measures that are appropriate for the target population (Phase 2) Methods-Ensuring that the administration of the intervention align with the social expectations of the target population Phase 5: Revision The duet team will compile feedback from interventionists throughout the study and collect a caregiver satisfaction survey at the end of the intervention. These methods of feedback will be used to inform future iterations of the duet intervention In Phase 1, the CAP states that a literature review on goals procedures and outcomes should be conducted, that the needs of the community should be assessed, and meeting with community leaders should occur. These steps were performed in the Duet Study prior to translation. The original Duet modules were created through a community-based participatory research project partnering with the Maternity Care Coalition to recruit participants (Luo et al., 2019). Most families who participated in its inception were Black/African American (41%) or Hispanic (46%). In the development of this initial project, 69% spoke English at home and 23% spoke Spanish, the remaining spoke both English and Spanish at home.

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June 2021 | Volume 6 | Article 660166 target population and the iterative nature of adaptation. The current study sought to create an adapted version of the Duet intervention modules that would be linguistically accurate and culturally responsive across the heterogenous, Spanish-speaking population. Where the other two models included "language" as a step for translation, this study took a deep dive into this aspect of adaptation and aimed to develop modules that would be intelligible across Spanish dialects (e.g., speakers from Puerto Rico, Colombia, etc.). This study discusses the implementation of these general frameworks and specific suggestions for adaptation within each broad category. The original Duet modules are a set of early intervention videos created to improve the quality of early caregiver-child language interaction. The modules were created based on developmental science within a community-based participatory research (Shalowitz et al., 2009) framework. Researchers from the Duet team worked with the Maternity Care Coalition (MCC), a local home-visiting program, to identify evidence-based principles of early language interaction, co-construct the Duet goals, and build the modules. Caregivers from the community were also included in this initial step, 23% of whom spoke Spanish predominately (Luo et al., 2019). The modules focus on five key principles: General Awareness, Creating Opportunities, Conversational Duets, Scaffolding, and Harmonizing (see Table 2; Alper et al., under review 1 ; Luo et al., 2019). The six video modules, ranging from 5-30 min each, are narrated by members of a cartoon family (i.e., a mother, father, grandmother, young son, and toddler) who share their own experiences around early language development. This narrative is supplemented by real-life videos of caregivers interacting with their children, to ensure that the modules are representative of the cultural community (Alper et al., under review 1 ; Luo et al., 2019).
The original Duet modules were developed for families in under-resourced households who received home-visiting services in English. Results from the pilot study were promising (Alper et al., under review 1 ; Luo et al., 2019). This study describes 1) the process of adapting the Duet modules for predominantly Spanish-speaking families and 2) specific recommendations for developing culturally responsive intervention materials.

METHODS
Five steps were outlined in the creation of an ecologically valid adaptation of the Duet intervention modules, the most important of which drew upon input from the target community. These steps focused on methods aligned with the CAP (Domenech- Rodriguez and Wieling, 2005;Rodriguez et al., 2011) and EVM guidelines (Bernal et al., 1995). See Table 1 for detailed steps. The authors aimed to gain insight into caregivers' language use with their children and to gauge the cultural relevance of examples in the Duet modules. Merging these models and frameworks, the following five phases were developed in the adaptation of the Duet modules for use with predominantly Spanish-speaking participants: 1) Initial translation of the content 2) Focus group input and feedback 3) Revision of modules based on community feedback 4) Pilot testing 5) Revision.

Phase 1: Initial Translation of Content
The first phase involved direct translation of the Duet modules. This phase was important in making materials accessible to share with the target population (i.e., predominantly Spanish-speaking caregivers) for feedback. To achieve linguistic equivalence, several stakeholders reviewed the translations. The Duet team members involved in the translation process included a postdoctoral developmental psychologist, a graduate student studying developmental psychology, and a coordinator with a Bachelor of Science focusing on health and development. All three team members were fluent in Spanish, one was a native speaker, the other two held bachelor's degrees in Spanish language and had lived in Spanish-speaking communities. The Duet team members brought a perspective of content knowledge (i.e., early language development). A translation company provided expertise in Spanish language and grammar.
The English modules were first translated into Spanish by the native speaker on the Duet team. The other two Spanish-speaking team members independently reviewed and edited the initial translation. Then, the three Duet team translators came together to make suggestions and edits as a group. Next, these translated modules were sent to a translation company. The translation company created a back translation into English of the Duet team's Spanish translation. They also used the original English Duet modules to create a second forward Spanish translation.
The Duet team jointly reviewed all three versions of the modules, comparing the original English Duet modules to the company's back translation and the team's Spanish translation to the company's forward Spanish translation. If there were differences in translations among the versions, the team selected the translation deemed most intelligible to the majority of Spanishspeakers. During this phase, if there were words or phrases that the team was unable to come to a consensus on, they were flagged to be presented to caregiver focus groups. Likewise, words or phrases that might vary across different Spanish dialects were also catalogued to be presented at focus groups to obtain caregiver feedback. For example, some dialects use "bizcocho" for "cake" while others use "pastel." Since the Duet team was unable to come to a consensus as to which word was used most widely, the words were flagged to share with caregivers. The next phase in establishing linguistic and cultural equivalence was presenting portions of the updated translation to caregivers in focus groups.

Phase 2: Focus Group Input and Feedback
For phase 2, two three-hour-long focus groups were held in the greater Philadelphia area. Focus groups were conducted in Spanish and engaged caregivers interactively with the Duet materials. Caregivers were given questionnaires about their demographic information, language use, and perspectives on early language development. Fourteen Spanish-speaking caregivers were recruited through Duet's community partner, MCC. The Duet team shared flyers with MCC's home-visitors who then identified Spanish-speaking clients who had a child between 1 and 5 years of age. All participants identified as female and Hispanic and ranged in age from 25 to 39 years old (M 30.57, SD 4.74) (see Table 3 for demographic information). All participants resided in households where the income fell below the 200% federal poverty threshold and all (except one who was pregnant) had at least one child under the age of five. All caregivers had a bachelor's degree or less. These demographic characteristics were similar to the intended participants for the Duet 2.0 intervention. All participants reported speaking Spanish "well" or "very well." Most participants reported primarily speaking Spanish at home (n 11). Research conducted in this study was approved by the Temple University IRB (protocol number: 26195).

First Focus Group
During the first focus group, the Duet team presented pictures of objects and phrases that were flagged in the creation of the final translation draft (e.g., a picture of a cake). The team first asked participants to individually answer, "What word do you use?" and "What word do you think the majority of Spanish-speakers would use?". Participants were instructed to write down their answers to both questions and turn them in to the researchers. Once answers were turned in, caregivers discussed their responses as a group. This discussion allowed participants to consider other possible words that they may not have generated individually. After the discussion, participants were given an opportunity to change their answer to the second question (i.e., "What word do you think the majority of Spanish-speakers would use?") on a separate piece of paper.
This format was very engaging, as evidenced by all caregivers actively participating in the discussion. In asking the first question, "What word do you use?", the team sought to acknowledge each caregiver's experiences as a native speaker. By asking the second question, the Duet team aimed to both acknowledge each caregiver's own experiences as members of Spanish-speaking communities and to find consensus on words that were intelligible across dialects.
During this focus group, caregivers were also shown videos from the original Duet modules of parents interacting with their children. These videos occurred across a variety of daily life settings (e.g., toothbrushing, folding clothes, etc.). Caregivers were asked if these settings and interactions were similar to interactions they had with their own children. Parents were also encouraged to share other settings that they thought should be added to the modules.

Second Focus Group
In the second focus group, the Duet team read translations of short caregiver-child interactions that serve as examples in the modules. Caregivers were shown the module slides as Duet team members read a cartoon character's part. After each example, caregivers were asked, "Does the concept make sense?". Overall, caregivers reported that the examples from the modules (e.g., interactions during breakfast, in the grocery store, and with books, etc.) were relevant to their daily lives.
Caregivers were asked for feedback about words that young children would use or that a caregiver would use with a young child in Spanish [e.g., "Are the words that Ashley (the cartoon toddler) uses similar to words that your child uses or used at her age?"]. Caregivers who had children between the ages of 12 months and 5 years were specifically recruited to help answer these questions. Responses allowed researchers to determine the appropriateness of the Spanish words used by and with the toddler in the modules. This was important because in some cases, grammatical structures in one language are more difficult to acquire in the other. For example, in English "eat it" is more complex in Spanish "cómetelo" (Domínguez, 2003).
During both focus groups, caregivers were asked to give feedback about words, phrases, and content. The Duet team asked questions like, "Would you say this differently? If so, how?", "Are there any additional examples you would like us to make or add?" and "Are the Duet modules relevant to your daily life?" Outside of the translations provided, caregivers were

Phase 3: Revision of Modules Based on Feedback and Inclusion of Culturally Relevant Examples
During phase 3, the Duet team revised the modules by incorporating videos of Spanish-speaking caregivers interacting with their children and the feedback from the focus groups. Within the Duet modules, there are example videos of real caregivers interacting with their children in everyday activities. The team sought to ensure that the adapted modules contained cultural, ethnic, and linguistic content representative of the target audience. Thus, Spanish-speaking, caregiver-child dyads were recruited to film additional real-life interaction videos. Caregivers who wanted to participate in the videos were asked to interact with their children as they normally would. All caregivers who agreed to be filmed spoke in Spanish with their child/ren. Speaking in Spanish was not a requirement for participation; it was the language that caregivers chose to use with their children. Clips from these interaction videos were added to both the English modules (with English subtitles) and to the Spanish modules.

Data Aggregation
To determine which words to use, the Duet team counted the number of endorsements from the question, "What word do you think the majority of Spanish-speakers would use?" If a word was the most highly endorsed both before and after the discussion, that word was selected for use in the modules (see Tables 4, 5). For example, if participants most frequently wrote the word "balón" for ball before and after the discussion, the word "balón" was used in the modules. If caregivers endorsed different words before and after the discussion, the two most highly endorsed words were discussed among the Duet team members. For example, if before the discussion, caregivers wrote the word "balón" most frequently, but after the discussion wrote "pelota," Spanish-speaking Duet team members reviewed the focus group recordings and came to a consensus on which word to use based on the discussion between the focus group participants and the research team. Finally, caregiver's votes from the phrases were tallied and the phrases that were most frequently endorsed were used in the Spanish modules.

Phase 4: Pilot Testing of Modules
The Duet team is currently in the process of phase four, testing whether the English and Spanish versions have similar effects on participants. To do so, English-and Spanish-speaking caregivers are being recruited to participate in the Duet 2.0 intervention, which will deliver the updated English and Spanish modules. Through the intervention, the team aims to improve caregiver knowledge about language development, the quality of caregiverchild interactions, and children's language outcomes. The intervention will be carried out over seven weeks. Each week, caregivers will watch a Duet module on their own time. After watching the video, caregivers will have a 30 to 60-min call with an assigned language interventionist at the caregiver's convenience. During the calls, the interventionist will discuss the module with the caregiver and guide them in incorporating the strategies into their daily lives.
This coaching model allows for flexibility in caregivers' schedules as well as in cultural beliefs and practices. Two of the three interventionists in the study are native Spanishspeakers. Interventionists have been rigorously trained about early language development, including language development for Dual Language Learning children. Trainings will also involve discussions about cultural practices and considerations. Data from the focus groups, namely, caregivers' perspectives and expectations about early language development, will also be used to inform interventionists' coaching practices. As the intervention progresses, interventionists will meet biweekly with the research team to share their experiences with coaching families. This community of practice will give interventionists an opportunity to share successes and discuss ways to better address the needs of the families they serve. It will also allow the research team to uncover any need for additional linguistic and cultural adaptations or considerations that were not revealed in the focus groups.

Phase 5: Revision
After the translated modules are implemented in the Duet 2.0 intervention, the authors will determine whether the English and Spanish versions of the modules have similar effects on participants. Although the input from caregivers in the focus group was integral in informing the adaptation of the modules, this is an iterative process. The feedback that is received from Spanish-speaking families after the intervention will be incorporated into future delivery of the Duet intervention modules.

DISCUSSION
The purpose of the current study was to adapt a CI-NCI for use with predominantly Spanish-speaking families and to create a set of guidelines to aid researchers in the cultural and linguistic adaptation of intervention materials. To that end, the current study describes the progress made towards adapting the early intervention modules using a five-phase model. These five steps include: 1) Initial translation of the content 2) Focus group input and feedback 3) Revision of modules based on community feedback 4) Pilot testing and 5) Revision. While many of the steps replicated previous models (Bernal et al., 1995;Domenech Rodriguez and Wieling, 2005), this study paid particular attention to the linguistic adaption as it was designed to be used across multiple dialects of Spanish.
Like previous studies involving CI-NCI adaptation (e.g., Cycyk et al., 2020), this study involved multiple, iterative steps. During the initial translation and focus group phases, the authors included experts in: 1) the content (i.e., the Duet team members), 2) the Spanish language (i.e., the translation Frontiers in Education | www.frontiersin.org June 2021 | Volume 6 | Article 660166 6 company), and 3) the lived experience of raising Spanishspeaking children (i.e., the focus group caregivers). In phase 3, researchers aggregated the essential information caregivers provided about their experiences with language as Spanishspeakers and their experiences with their own children's language development. Caregivers' input informed language choices and the cultural appropriateness of interaction examples. Additionally, naturalistic caregiver-child interactions were included in the final version of the Duet modules to expand the linguistic, ethnic, and cultural diversity.
One strength of using CI-NCI models with culturally and linguistically diverse families, is that they do not aim to change routines or day-to-day activities (e.g., adding dialogic reading). They aim to change the interactions that happen during these routines (Cycyk et al., 2020). This model allows families to continue engaging in activities that they normally do (e.g., cooking dinner, doing chores, etc.) but asks them to consider ways to build upon those interactions. CI-NCIs thus encourage caregivers to continue their usual routines while supporting them in their communication practices.
The ongoing phases reflect the need for testing with the target community and the flexibility needed in the iterative adaptation process. In testing the new modules in their entirety with predominantly Spanish-speaking caregivers, the authors will better understand which aspects of the modules have been successfully adapted and what may need further revision. Through the outlined phases, this paper emphasizes the importance of collaborating with community stakeholders in Post-discussion: What word do you think that the majority of Spanish speakers use?

Adaptation Challenges
The authors set out to adapt the Duet intervention modules for use with predominantly Spanish-speaking caregivers. However, this population is extremely heterogeneous. Incorporating the diversity across dialects and cultures present in the Spanish-speaking world was one of the main challenges. Although the authors recognize that dialects differ within countries, the team made the choice to define dialects as country (or territory in the case of Puerto Rico) of origin. In doing so, the research team included caregivers from as many Spanish-speaking countries or territories as possible.
Caregivers in this study represented four of the five most populous groups of Spanish-speaking countries/territories living within the United States (i.e., Mexican, Puerto Rican, Salvadoran, and Dominican, but not Cuban; Noe-Bustamante, 2019). These four groups comprise 79% of reported areas of origin in the United States (Noe-Bustamante, 2019). Additionally, to limit over-sampling of one dialect, the researchers systematically asked participants to identify the word they themselves would use, and the word they believed most Spanish-speakers would understand. Although the speakers were only from a few countries/territories, they differentiated between words they used and words that a broader group of Spanish-speakers would recognize. This was evidenced by the differences in their responses to the two questions and in the resulting discussion.
Other limitations of this study include a small sample size and that all participating caregivers were mothers. Although a small number of caregivers participated in the focus groups this study plans to enroll more participants in the pilot study. Furthermore, all caregivers in the focus groups were mothers. This is a common limitation across developmental studies which often do not include fathers or other caregivers (Parent et al., 2017). However, while other secondary caregivers may be involved in children's lives, based on participation in the focus groups it may

English Verbs and phrases
Spanish words (frequency) Final verbs and phrases choice "Which of these two would the majority of Spanish-speakers understand? (e.g., how many of you would say this, how many of you would say that) is there another verb or phrase you would use? " Verbs Crying, looking, smiles, frowns, noises, and pointing are all things ashley did to communicate before she ever talked Fruncir el ceño (0), fruñir (0), fruñir las cejas (8) Fruñir las cejas He's holding a bat Sosteniendo (5) (2), actividades cotidianas (0), actividades diarias (6) Actividades diarias A conversation is a duet, not a solo. Participating in the back-andforth conversation helps kids learn to communicate Conversaciones de ida y vuelta (2), intercambio de palabras (2), conversación de un lado a otro (1), conversación bidireccional (0), conversación de dos vías (0), conversación en dúo (0) Conversaciones de ida y vuelta a Do you want milk, the apple, or both? Las dos (5), ambos (1) Las dos Mom you need to figure out what ashley really wants before she makes a scene in the store Arme un escándalo (1), haga un berrinche (5) Haga un berrinche The back-and-forth conversation between Mom and ashley is what we call a "conversational Duet" Dúo de conversación (5), dúo conversacional (0), dueto conversacional (0)

Dúo de conversación
Time to eat! Hora (8), tiempo (0) Hora Follow your child's lead Pasos (0), intereses (8) Intereses There are lots of reasons why giving just enough help is a good thing. My parents want ashley to feel like she can do things on her own and to help her not get frustrated Ayuda necesaria (3), ayuda justa (0), ayuda suficiente (4) Ayuda suficiente While childcare was provided at the focus groups, parents moved freely and occasionally checked on their children. Thus, during some of the voting, not all parents voted. a No consensus among participants, research team decided.
Frontiers in Education | www.frontiersin.org June 2021 | Volume 6 | Article 660166 8 be that mothers tend to be the primary caregivers in the target population.

CONCLUSION
The current study used a multi-perspective approach to create an adaptation of an early language intervention that was linguistically and culturally appropriate as well as a blueprint for researchers adapting intervention materials. The Duet team made use of their own expertise in the field of early language development, the translation company's mastery of the Spanish language, and caregiver's knowledge and life-experience to create modules that are accessible across multiple dialects of Spanish. While there is evidence that researchers translate materials into Spanish (Larson et al., 2020), there is a need to ensure that these materials are also ecologically valid. Despite this need, there are very few studies which describe the successful incorporation of families' perspectives into the multifaceted translation process. This study sought to describe successful strategies for incorporating caregivers' perspectives into an early intervention and to inspire researchers to develop both linguistically and culturally valid materials in the future.

DATA AVAILABILITY STATEMENT
The raw data supporting the conclusions of this article will be made available by the authors, without undue reservation.

ETHICS STATEMENT
The studies involving human participants were reviewed and approved by the Temple University's Human Research Protection Program (HRPP). The patients/participants provided their written informed consent to participate in this study.

AUTHOR CONTRIBUTIONS
BR, RA, JJ, LM, RL, MM, RMG, and KH-P contributed to conception and design of the study. BR wrote the first draft of the manuscript. BR, RA, JJ, LM, RL, EB, and KH-P wrote sections of the manuscript. All authors contributed to manuscript revision, read, and approved the submitted version.

FUNDING
This project was funded by the William Penn Foundation, grant #GR-000031281.