ABSTRACT
In this chapter we describe single-subject designs, a subcategory of quasi-experimental time-series designs that can be used with very few participants. These single-subject designs have many of the characteristics that govern traditional group time-series designs, such as the numerous repeated measures on each participant and the initiation and withdrawal of treatment. Using very few participants increases the flexibility of the design but limits the generalizability of the results. The data obtained from these designs usually are not subjected to statistical methods. When statistical methods are applied, the types of analyses used are often unique to these designs.
