The objective of the project was to unify the efforts of the classroom teacher and the college faculty in observing and guiding the teacher trainee in classroom teaching practice. Two coding systems, one on teacher behavior and one on pupil behavior, were used to establish a common language for professional dialogue on description of and prescription for teacher trainee performance. The common focus served to coordinate the energies of all participants in the experimental program. The project offers a model for coordinating the efforts of classroom teachers with college faculty in diagnosing and prescribing teaching practice for teacher trainees toward the goal of performance-competence. Sample forms are included. (Author/SE)