THE ADVANTAGES AND PROBLEMS OF EXPANDING THE BEHAVIOR LABORATORY FROM THE CLINIC TO THE CHILD'S HOME ARE DISCUSSED. RECENTLY, ATTEMPTS HAVE BEEN MADE TO DELINEATE THE EXACT OPERATIONS RESPONSIBLE FOR TREATMENT EFFECTS. TRADITIONALLY, THERAPY HAS BEEN CLINIC BASED. HOWEVER, HOME VISITS ARE IMPORTANT BECAUSE--(1) THE THERAPIST SHOULD OBSERVE PROBLEM BEHAVIORS AT FIRST HAND, (2) SOME BEHAVIOR CAN ONLY BE OBSERVED IN THE NATURAL SETTING, AND (3) PARENTAL ENVIRONMENT IS PRIMARILY RESPONSIBLE FOR THE DEVELOPMENT OF ACCEPTABLE AND DEVIANT BEHAVIORS OF THE CHILD. IF THE THIRD CAUSE IS ACCEPTED, DEVIANT BEHAVIOR IS LIKELY TO REAPPEAR AFTER TREATMENT IS FINISHED. ACCORDING TO BEHAVIORISTIC TREATMENT METHODS, THE THERAPIST MUST TEACH THE PARENT NEW AND SPECIFIC WAYS OF INTERACTING WITH THE CHILD. SIGNALS ARE OFTEN USED TO TEACH THE MOTHER NEW RESPONSES. TREATMENT OF PROBLEM BEHAVIORS IN THE HOME CAN BE COMBINED WITH EXPERIMENTAL RESEARCH ALTHOUGH THE HOME LACKS SOME ASPECTS OF CONTROL. A RECORDING TECHNIQUE FOUND USEFUL IN MEASURING BEHAVIORS IN A VARIETY OF NATURALISTIC SETTINGS IS DESCRIBED. THIS SPEECH WAS PRESENTED AT THE AMERICAN PSYCHOLOGICAL ASSOCIATION CONVENTION (75TH, WASHINGTON, D.C., SEPTEMBER 1967). (PR)