This paper describes a prepracticum laboratory in supervision skills, developed at Purdue University for counseling psychology students and others as a prerequisite to a practicum in supervision. The three parts of the supervision lab are described in detail including: (1) an initial analysis phase in which participants identify their baseline behavioral styles, i.e., a focus on process or role behaviors; (2) training to compensate for the idiosyncratic styles which have been identified through a presentation of a series of models, i.e., the Discrimination Model, Interpersonal Process Recall, Microtraining, and live supervision; and (3) a final unit presenting segments on evaluation and ethical situations. A discussion of the effects of the prepracticum lab along with issues to be addressed in the future, e.g., questions relating to the timing of supervision for both supervisor and counselor, is presented in the final section. (PAS)