This 2-year, nationally funded project is the largest UK research project into CPD in mathematics education to date. It was led by Project Director Dr. Els De Geest from the University of Oxford with researchers form University of Bristol, Kings College London and University of Birmingham, and supported by the National Centre for Excellence in Teaching Mathematics (NCETM).  The CPD initiative – a local Children’s Mathematics Network group in Bristol – is featured in the final report (with a focus on the Bristol CMN group) as one of six successful national CPD initiatives.