To make teacher evaluation more effective and meaningful, supervisors must ensure that two-way communication takes place in all phases of the evaluation process, including planning and the collection and use of information. The easiest way to evaluate teachers is to look only at outcomes--the method recommended in management-by-objectives (MBO) procedures. However, to guarantee good interpersonal interaction the MBO evaluation method should use a team of evaluators. Supervisor interaction with teachers must also overcome several barriers. First, supervisors' feedback and their offers of assistance must not threaten teachers' self-esteem and must promote teacher-supervisor trust. Feedback focused on the teaching job and oriented to the future is most effective. To be able to communicate in the most useful way, supervisors should also acquire skills in different verbal styles. Another barrier supervisors must overcome is verbal and nonverbal blocking behavior (by teachers, supervisors, or both), which can restrict teacher-supervisor interaction. Supervisor communication with teachers during evaluation is further improved when the supervisor knows his or her own behavior, needs, and skills as well as those of the teachers and students. (RW)