ABSTRACT
Single subject research is a form of rigorous investigation in which the individual is the unit of analysis. Individual variability of each participant is measured as opposed to the mean performance of groups. This allows for the examination of individual responding of participants during and following an intervention using previous performance (baseline measures) as a control (Sidman, 1960). Variability and experimental control are evaluated through visual inspection of graphed data (Skinner, 1938) and confirmed through independent and systematic replication both within and across research studies. Therefore, it is a misnomer that single subject designs have an N of 1; in fact, most studies have three or more participants.
