The Selective Observation Simulator (SOS) is a program of continuous sound recording and synchronized sequenced still pictures for development of inservice or preservice teachers' skills involving selective observation and class awareness. The trainee listens to taped instructions through earphones and watches self-selected pictures in a projection booth. Films are still-frames in timed sequence, displayed between .5 and 20 second intervals, synchronized with the sound tape by the controller of the Variable-Interval Sequenced-Camera (VINSAC). Five FINSAC cameras, triggered by the controller and mounted side-by-side in a disguise box above the teacher's chalkboard, photograph a wide angle, left-front, left-rear, right-rear, and right-front view of the class, respectively, thus producing five simultaneous films in identical frame-by-frame timing. The trainee in the booth views first the entire class (camera 1), then is instructed to select a closeup view of his choice by pushing one of four buttons on the control panel. If trainee preoccupation with one particular view exceeds a predetermined time period, the screen darkens, and the taped voice encourages frequent view changes, typical of an alert teacher. The observation period lasts typically 10 to 15 minutes. (For related information, see EC 052 044.) (MC)