In 2019, the Department for Education (DfE) commissioned a consortium of evaluation and early years assessment specialists to evaluate the first phase of Early Years Professional Development Programme (EYPDP1). The evaluation was led by Ecorys, with the National Foundation for Educational Research (NFER), Professor Kathy Sylva (the University of Oxford) and A+ Education (now Inquisitive Minds). Originally, the evaluation sought to conduct a feasibility assessment, a randomised controlled trial (RCT), and an implementation and process evaluation. Due to national restrictions on conducting research in March 2020 (due to the COVID-19 pandemic), the evaluation was adapted to commence in 2021 with a new cohort of early years settings within the 50 local authorities involved in EYPDP1. For a range of reasons, including the impact of the pandemic on the programme and the sector, in March 2022, the RCT was stopped. Later in 2022, the Ecorys evaluation team was asked to conduct a small-scale retrospective process evaluation of EYPDP1 with a small number of EYPDP1 participating local authorities and early years settings. The process evaluation comprised interviews with 7 local authority leads and 5 setting representatives. The evaluation sought to explore local authority leads' and early years practitioners' perceptions of the training, programme implementation (including enablers and barriers), perceptions of impact, and suggestions for improvements.