The behavioral technique chosen to modify her maladaptive behavior was facial screening: a form of punishment involving the application of a face cover contingent on the target response. An ABAB single-case experimental design was used to assess the effects of this mildly aversive stimulus on frequency of spoon banging . During a baseline period a frequency count was made to deter mine the extent of spoon banging during each 15-minute eating session. A spoon banging response was “operationalized as two or more consecutive movements in which the subject held the spoon and rapidly turned her wrist causing an audible sound of metal hitting either the dish or table” (p.56). Sessions were videotaped and used to obtain a measure of observer reliability. Average reliability across the experimental sessions using a percent agreement measure was 96 percent. During the 16- day baseline stage a paraprofessional sat next to the child and said “no bang” each time a spoon banging response was made then gently grasped the child’s wrist and returned her hand to dish.