In Multiple Baseline Design, what is the primary purpose of sequentially introducing an intervention?

• A. To show effects by comparing baseline to intervention
• B. To determine individual preferences for specific interventions
• C. To minimize the duration of each intervention
• D. To evaluate multiple behaviors simultaneously

Answer: (A)

The primary purpose of sequentially introducing an intervention in Multiple Baseline Design is indeed to show effects by comparing baseline data to intervention data for each individual or setting. This design allows for the demonstration of the causal relationship between the intervention and the observed changes in behavior.

By implementing the intervention in stages across different contexts, individuals, or behaviors, it becomes possible to assess whether changes are occurring in response to the intervention rather than as a result of external factors or natural fluctuations. Each baseline phase establishes a clear reference point, and when the intervention is applied, any improvements can be directly linked to it. This systematic approach strengthens the inference that the intervention is responsible for the observed effects, lending credibility to the findings.

In this design, if the behavior changes only after the intervention is introduced in each subsequent baseline, this further supports the evidence for the effectiveness of the intervention, allowing researchers to make more robust conclusions regarding its impact.

The other options do not align with the fundamental purpose of Multiple Baseline Design. For example, determining individual preferences focuses on subjective input rather than objective measurement of behavior change, while minimizing the duration of each intervention and evaluating multiple behaviors simultaneously do not reflect the sequential nature of how interventions are introduced and analyzed in this specific research design.