This article details the development of a tool to measure the cultural competence of individuals working within the Children and Adolescent Mental Health Services (CAMHS). The CAMHS Cultural Competence in Action Tool - known as the CAMHS 'CCATool' - was one of the components of a national project which aimed at promoting cultural competence within CAMHS. The other component was a two day training programme. Both components were based on the Papadopoulos, Tilki and Taylor model of cultural competence development. The article also outlines the educational principles and learning strategies used in the training.