This is an account of six experimental courses of in-service training, designed to help existing mental handicap staff to adapt their work-processes and attitudes in order to respond more readily to the challenge of the newer mental handicap strategies and attitudes which are now developing throughout the world. All the courses involved collaboration between statutory and voluntary agencies, and they permitted experiment in the use, for in-service training purposes, of the general educational system. A narrative account of the first three courses is given, together with an objective evaluation of the second three. In addition, a specially-contributed paper describes the vital role of general educational establishments in helping to meet the growing need for in-service training and education amongst staff of the health and social services.