To Evaluate the Efficacy of a New Intervention Procedure, a Clinician

Multiple Choice

To evaluate the efficacy of a new intervention procedure, a clinician observes a patient's behavior before and after the intervention. The clinician then repeats the procedure, again observing the patient's behavior before and after the introduction of the treatment. Which single-case experimental design best describes the clinician's investigation?

A) A-B-A-B design
B) A-B-BC-B design
C) A-B-C-A design
D) A-B-AB-A design