Most investigators using single-case experimental designs use interobserver agreement (IOA) checks to enhance the credibility of the collected data, and they report the results of those assessments using percentage of agreement estimates. An alternative is to graph both observers' records of the measured behavior on the primary study graphs. Such…

Many researchers and clinicians believe that the therapeutic relationship is essential in bringing about clinical change. Empirical research to support this contention is scarce in part due to the difficulty of specifying and measuring theoretically derived mechanisms of change and the important dimensions of the client-therapist relationship.…