Between September 2017 and May 2022, NFER undertook the evaluation of TLIF, a three-year funding programme which aimed to support projects offering high-quality continuing professional development (CPD) for teachers and school leaders in the areas and schools in England that needed it most. The overall aim was to improve the outcomes of children and young people, thereby making a significant contribution towards tackling social mobility. The evaluation focused on eight projects delivered by: Ambition Institute; EdisonLearning; Education Development Trust and Chartered College of Teaching; Geographical Association and Association for Science Education; Institute of Physics; Teacher Development Trust; Teach First and Tom Bennett Training.