Figure 2.

Responses per minute for “Kevin” (first row) and “excuse me” (second row) during the CR schedule (open triangles) and no-Sr+ schedule (filled circles) and cumulative initial-link selections during the preference assessment (third row) for Beth, Ed, Sam, and Lou across sessions. The data depicted prior to the phase line were collected during the efficacy evaluation, and the data after were collected during the preference assessment.