Background Despite an increasing number of training opportunities in implementation science becoming available, the demand for training amongst researchers and practitioners is unmet. To address this training shortfall, we developed the King’s College London ‘Implementation Science Masterclass’ (ISM), an innovative 2-day programme (and currently the largest of its kind in Europe), developed and delivered by an international faculty of implementation experts. Methods This paper describes the ISM and provides delegates’ quantitative and qualitative evaluations (gathered through a survey at the end of the ISM) and faculty reflections over the period it has been running (2014–2019). Results Across the 6-year evaluation, a total of 501 delegates have attended the ISM, with numbers increasing yearly from 40 (in 2014) to 147 (in 2019). Delegates represent a diversity of backgrounds and 29 countries from across the world. The overall response rate for the delegate survey was 64.5% (323/501). Annually, the ISM has been rated ‘highly’ in terms of delegates’ overall impression (92%), clear and relevant learning objectives (90% and 94%, respectively), the course duration (85%), pace (86%) and academic level 87%), and the support provided on the day (92%). Seventy-one percent of delegates reported the ISM would have an impact on how they approached their future work. Qualitative feedback revealed key strengths include the opportunities to meet with an international and diverse pool of experts and individuals working in the field, the interactive nature of the workshops and training sessions, and the breadth of topics and contexts covered. Conclusions Yearly, the UK ISM has grown, both in size and in its international reach. Rated consistently favourably by delegates, the ISM helps to tackle current training demands from all those interested in learning and building their skills in implementation science. Evaluation of the ISM will continue to be an annual iterative process, reflective of changes in the evidence base and delegates changing needs as the field evolves.

Background: Despite an increasing number of training opportunities in implementation science becoming available, the demand for training amongst researchers and practitioners is unmet. To address this training shortfall, we developed the Kings College London ‘Implementation Science Masterclass' (ISM), an innovative two-day program (and currently the largest of its kind in Europe), developed and delivered by an international faculty of implementation experts.Methods: This paper describes the ISM and provides delegates’ quantitative and qualitative evaluations (gathered through a survey at the end of the ISM) and Faculty reflections over the period it has been running (2014-2019).Results: Across the 6-year evaluation a total of 501 delegates have attended the ISM, with numbers increasing yearly from 40 (in 2014) - 147 (in 2019). Delegates represent a diversity of backgrounds and 29 countries from across the world. The overall response rate for the delegate survey was 64.5% (323/501). Annually the ISM has been rated ‘highly’ in terms of delegates’ overall impression (92%), clear and relevant learning objectives (90% and 94% respectively), the course duration (85%), pace (86%) and academic level 87%) and the support provided on the day (92%). Seventy-one percent of delegates reported the ISM would have an impact on how they approached their future work. Qualitative feedback revealed key strengths include the opportunities to meet with an international and diverse pool of experts and individuals working in the field, the interactive nature of the workshops and training sessions and the breadth of topics and contexts covered.Conclusions: Yearly, the UK ISM has grown, both in size and in its international reach. Rated consistently favorably by delegates, the ISM helps to tackle current training demands from all those interested in learning and building their skills in implementation science. Evaluation of the ISM will continue to be an annual iterative process, reflective of changes in the evidence base and delegates changing needs as the field evolves.