AUTHOR=Walton Holly , Crellin Nadia E. , Sidhu Manbinder S. , Sherlaw-Johnson Chris , Herlitz Lauren , Litchfield Ian , Georghiou Theo , Tomini Sonila M. , Massou Efthalia , Ellins Jo , Sussex Jon , Fulop Naomi J. TITLE=Undertaking rapid evaluations during the COVID-19 pandemic: Lessons from evaluating COVID-19 remote home monitoring services in England JOURNAL=Frontiers in Sociology VOLUME=Volume 8 - 2023 YEAR=2023 URL=https://www.frontiersin.org/journals/sociology/articles/10.3389/fsoc.2023.982946 DOI=10.3389/fsoc.2023.982946 ISSN=2297-7775 ABSTRACT=Rapid evaluations offer evidence on innovations in health and social care that can be used to inform fast-moving policy and practice, and support their scale-up according to previous research. However, there are few comprehensive accounts of how to plan and conduct large-scale rapid evaluations, ensure scientific rigour, and achieve stakeholder engagement within compressed timeframes. Using a case study of a national mixed-methods rapid evaluation of COVID-19 remote home monitoring services in England, conducted during the COVID-19 pandemic, we examine the process of conducting a large-scale rapid evaluation from design to dissemination and impact, and reflect on key lessons for conducting future large-scale rapid evaluations. We describe each stage of the rapid evaluation: convening the team (study team and external collaborators), design and planning (scoping, designing protocols, study set up), data collection and analysis, and dissemination. We reflect on why certain decisions were made and highlight facilitators and challenges. We conclude with twelve key lessons for conducting large-scale mixed-methods rapid evaluations of healthcare services. We propose that rapid study teams need to: 1) find ways of quickly building trust with external stakeholders, including evidence-users; 2) consider the needs of the rapid evaluation and resources needed; 3) use scoping to ensure the study is highly focused; 4) consider what cannot be completed within a designated timeframe; 5) use structured processes to ensure consistency and rigour; 6) be flexible and responsive to changing needs and circumstances; 7) consider the risks associated with new data collection approaches of quantitative data (and their usability); 8) consider whether it is possible to use aggregated quantitative data, and what that would mean when presenting results; 9) consider using structured processes & layered analysis approaches to rapidly synthesise qualitative findings; 10) consider the balance between speed and the size and skills of the team; 11) ensure all team members know roles and responsibilities and can communicate quickly and clearly; and 12) consider how best to share findings, in discussion with evidence-users, for rapid understanding and use. These lessons can be used to inform the development and conduct of future rapid evaluations in a range of contexts and settings.