Which experimental design begins with concurrent measurement of two or more behaviors in a baseline condition, followed by the application of the treatment variable to one behavior while baseline conditions remain in effect for the other behaviors, and then applying the treatment sequentially to the others?

• A. Naturally Existing Contingency
• B. Motivating Operation
• C. Multiple Baseline Design
• D. Multiple Exemplar Training

Answer: (C)

Multiple baseline design across behaviors begins with concurrent baselines across two or more behaviors, then applies the treatment to one behavior while the others remain in baseline, and finally introduces the treatment to the remaining behaviors sequentially. This approach demonstrates that changes in the treated behavior are due to the intervention, not external factors, because the other behaviors stay stable while the first target changes, and the effects replicate as the treatment is rotated to additional targets. It’s a design that lets you show experimental control without withdrawing treatment. The other options refer to concepts or methods that aren’t these sequential baselines across multiple behaviors.