What does the phase labeled "B" in a single-system design typically represent?

In a single-system design, the phase typically labeled as "B" represents the intervention phase. This phase comes after the baseline phase, during which data is collected to establish a reference point for the participant's behavior, condition, or circumstances.

The intervention phase involves implementing a specific treatment or intervention intended to bring about change in the target behavior or condition. The effectiveness of this intervention is assessed by comparing data collected during this phase to the baseline data. It allows practitioners to evaluate whether the intervention produces the desired effects and to make evidence-based decisions regarding its effectiveness in practice.

The other labels in this design serve distinct purposes. The baseline phase establishes a clear measurement of the situation prior to any intervention, and the follow-up phase would typically come after the intervention to assess the longevity of the treatment effects. Understanding these phases is critical for social workers in designing effective interventions and evaluating their impact.