The correct assessment of observable student behavior is an important tool in the ongoing education process. Whether the setting is a classroom, a field experience, an activity, or a residential treatment center, proper evaluation techniques will provide information for the determination of policies and programs. The Flexible Observation Instrument for Student Behavior (FOISB) uses different variables and incorporates them into a code which facilitates recording and allows the observing teacher to move from one student to the next in a relatively short interval of time. FOISB is particularly valuable in the evaluation of field experiences because of the short time it takes to record the needed data. The observer records the child's behavior according to (a) with whom he/she is interacting, (b) the child's general behavior, and (c) the specific nature of the behavior. The first two behaviors recorded are used to determine the third, more specific behavior from a list of possible alternatives. (Extensive definitions of all behaviors are included.) (MK)