Single-system designs are practitioner-oriented in the here-and-now situation. They provide vital feedback on what the practitioner needs to know to move the case in desired directions. They are...

Single-system designs are practitioner-oriented in the here-and-now situation. They provide vital feedback on what the practitioner needs to know to move the case in desired directions. They are flexible designs, capable of changing as new events occur in the client’s circumstances, including allowing new targets. Traditional group designs cannot be changed once the study has begun.