The Fear Survey Schedule (FSS) provides quantitative information about patients' reactions to a great variety of possible sources of maladaptive emotional reactions. The reactions tapped by the Schedule are nearly always fearful, fear-tinged or fear-related and always unpleasant. The use of quantitive information about fear reactions is an outstanding feature of the practice of behavior therapy, the distinctive class of psychotherapeutic techniques which have emerged from experimentally derived principles of learning. Since it is necessary in the application of behavior therapy to obtain a coherent picture of the stimulus antecedents of neurotic reactions, the Schedule can frequently save a great deal of effort in revealing reactions to many stimulus classes in a short time.