The effectiveness of a system of supervision of classroom teaching, involving the videotaping of instruction and an objective evaluation instrument, was investigated using eight veteran English teachers. The system was designed to correct weaknesses in supervision, based on classroom observation, conferences, and reports on the observations and the conferences. The teachers were videotaped in their classrooms on two occasions, a year apart. Following the first videotape, all eight viewed their teaching, responded to an open-ended question, were presented the results of the objective instrument, and were taught the categories of the instrument. Participants practiced during the intervening year, in those areas which they considered needed improvement. After the second videotaping, the procedure was evaluated by examining the teachers' initial perceptions of their teaching and the extent and nature of changes brought about by the videotaping and use of the objective evaluation instrument. The procedures used were interpreted as an effective alternative to traditional methods of supervising English instruction. (Author/AA)