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…

Experimental research involves comparing two or more conditions. One of those conditions in single subject research is often the baseline. Adequate description of the baseline conditions is necessary for evaluating the effects of independent variables, drawing generalizations from studies, and providing information for subsequent replication…

This paper describes the parallel treatments design, a nested single subject experimental design that combines two concurrently implemented multiple probe designs, allows control for effects of extraneous variables through counterbalancing, and replicates its effects across behaviors. Procedural guidelines for the design's use and issues related…