A paradigm of rehearsal interaction, based on the measurement and interpretation of behavioral transactions between actors and directors, is posited in this article. Verbal and nonverbal communication processes characteristic of actor/director interactions are operationally defined, and indexes of director/actor interaction, director/actor talk ratio, and director influence ratio are organized according to a general matrix analysis system. Suggestions are given for further investigations to describe and to evaluate the rehearsal process in order to improve the quality of interaction, stimulate the acquisition of effective skills, and encourage positive attitudes. (KS)