Which withdrawal design ends on baseline during the withdrawal phase?

• A. A-B-A design
• B. ABAB Design
• C. A-B-A-B design
• D. Anecdotal Observation

Answer: (A)

In a basic withdrawal (reversal) design, you start by establishing a baseline without the intervention, then apply the treatment and observe a change, and finally withdraw the treatment to see if the behavior returns to baseline. The key point is that the withdrawal phase ends with the behavior back at baseline, showing that removing the intervention reverses its effect. This characteristic makes it the design that ends on baseline during the withdrawal phase. Designs that reintroduce treatment after withdrawal end with the treatment phase again, not baseline, and a pure observational (anecdotal) approach doesn’t manipulate variables in a way that creates a withdrawal sequence.