How can a "baseline" be defined in behavior analysis?

A "baseline" in behavior analysis is defined as the initial data collected before any intervention is implemented. This initial measurement is critical because it serves as a reference point against which the effectiveness of the intervention can be evaluated. By establishing a clear baseline, practitioners can identify the frequency, intensity, or duration of a specific behavior prior to any treatment, allowing for a comparative analysis of how much the behavior changes as a result of the applied interventions. This allows for a better understanding of the impact of the treatment on behavior and helps ensure that any observed changes can be attributed to the intervention rather than fluctuations that might occur naturally over time.

The other options do not accurately capture the essence of what a baseline is in behavior analysis. The final outcome measurement after treatment refers to post-intervention data, the range of acceptable behaviors in clients is more related to behavioral expectations rather than measurement, and the percentage of successful behavior change describes a quantifiable outcome rather than the initial assessment phase.