An observational recording system was devised to record and to replay the stream of classroom events--nonverbal events, as well as verbal. Although videotape recording/closed circuit television has been used in similar systems, the one here used selected 35mm. stills made from 16mm. film. The stills were then synchronized with tape recordings and projected by a Carousel projector. In addition to its use as a research tool, replay of edited material to teachers or student teachers may be used to illustrate a point in a lecture or seminar. It may also be used to enable teachers to make their own observations. It is hoped that a library of recorded incidents will be built up, perhaps associated with case study material. (MF)