Role play is discussed as an aid to the implementation of New Careers programs in human service agencies. Goals of the New Careers programs include: (a) expansion of health, education, and welfare institutions, (b) meaningful jobs for the underemployed, (c) advancement opportunities for all human service agency employees through in-service training, and (d) development of new skilled and professional manpower. Role play is defined in context, and its functions discussed. Consideration is given to (a) the protected environment of role play, (b) role play as an aid to group process and increased self-knowledge, (c) implications for learning new ideas, teaching new communications, and leadership skills, (d) dealing with ambiguity, and (e) modification of behavior through role playing. A second section is a manual on how to conduct role playing sessions. It discusses the role of the trainer, techniques and methods for stimulating interest, and incidental learnings in the process. (BP)