Single-Case Experimental Design

Single-case experimental design (also known as time-series design) is a research methodology characterized by repeated assessment of a particular phenomenon (often a behavior) over time, and generally is used to evaluate interventions. There are three general types of single-case experimental designs, which differ according to their structure and purpose: within-series, between-series, and combined-series. Overall, single-case experimental designs offer an alternative to group designs in that they are particularly appropriate for, although not limited to, comprehensively evaluating interventions for individual clients. Because the client is repeatedly assessed across time, the single-case experimental design allows for investigation of client variability (i.e., changes) in response to treatment. Usually, this type of comprehensive information is unobtainable in group designs.