A researcher is planning to use an ABAB single systems design to evaluate a program that serves adolescents. More specifically, the researcher is interested to see if the program helps reduce amounts of anxiety after 30 days. What do the A and B phases stand for in a single systems design?

Question

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In an ABAB single systems design, "A" refers to the Baseline phase, where data is collected without intervention to establish a reference point for the individual's behavior or condition. "B" refers to the Intervention phase, where the treatment or intervention is introduced, and its effects on the individual are observed and recorded. This design allows for the comparison of behavior or conditions before and after the intervention, and then again when the intervention is withdrawn and reintroduced, to assess its effectiveness.

A Researcher Is Planning to Use an ABAB Single Systems