What´s Single System Design?

Furthermore, the specific single-system design that I used to evaluate my practice with my client is ABAB. According to Grinnell, Williams & Unrau (2014), ABAB single system design is used to monitor the effectiveness of intervention in an individual client and group of individuals such as school. In ABAB single design, a phase is a baseline; the client range of depression level before applying treatment. B is the first intervention administered to the client; which is the first yoga exercise attended for the depression and it shows that yoga exercise brought the range to the normal range. I withdrew the intervention to see how my client will do when I wean her off from the intervention which is A phase; and reintroduce B phase intervention