CORE Partnership Occasional Papers are aimed at the development of best practice in mental health particularly in the area of psychological therapy services or “talking therapy”. The primary readership is seen as practising clinicians and service managers and the data is based on practice based evidence gained in routine use of the CORE System rather than randomised control trial based evidence. The emphasis is therefore on ease of understanding and visual interpretation of the data rather than rigorous statistical analysis. We hope that the papers will be seen as complementary to academic papers.