This paper discusses the supervisory use of one observational system -- Observation Schedule and Record, Form 5V (OScAR 5V). OScAR 5V refers to a series of observation schedules to develop techniques for obtaining an objective, quantitative record of observed classroom behavior that could be scored on dimensions of teacher behavior. Under this system, the observer would and should have no idea as to what the instrument is supposed to measure, his only task being to record what he sees. Taking a pupil's point of view and adopting his kind of discriminations, the observer draws only those inferences a pupil might draw about the meaning of what is said. Such inferences might include whether the teacher is telling the pupil something he should learn and remember; whether he is asking a question the pupil is supposed to answer; or whether the teacher is looking for a certain answer he has in his head. The observer records the behavior on a machine-scorable or optical scanning form. (JF)