Cаrоl is а behаviоr analyst wоrking in a group home for adolescents with intellectual delays and behavior problems. JR is a resident in the group home and often engages in skin picking that causes chronic tissue damage. During JR’s summer break from school, Carol implements an intervention in the group home, which reduces JR’s skin picking to a near zero rate. However, Carol hears that JR continues to bite his wrist during visits to his family home. Carol meets with JR’s parents and asks them to begin taking baseline data on the wrist-biting. During this period, Carol trains the parents on the intervention, which eventually reduces skin picking in the family home. When JR’s school resumes in the fall, Carol meets with JR’s teacher to set up baseline data collection on wrist-biting in the classroom to see if the intervention is also necessary at the school. Which experimental design would be most appropriate for Carol to use?