Three studies of behavior therapy by a therapist who was also the clients' instructor are reported. All of the clients defined target behaviors, collected data, and implemented procedures to modify the behaviors. The data were brought to each session for analysis and revision each week. Case 1 reported modification of stealing behavior, where both impulses to steal and actual stealing behaviors were reduced. Time spent in negative self-evaluations was also decreased. Case 2 involved decreasing sulking behavior over a spouse's marital infidelity. Case 3 presented modification of job satisfaction, resulting in an increase of smiles, verbal behavior, i.e. initiating conversations, and contact with colleagues. (Author)