An empirical demonstration of the random stimulus design

The random stimulus design, a single case methodology, was described. This design is a variant of the reversal or withdrawal design; however, the same set of items is presented to a subject only a small percentage of the total number of experimental conditions rather than across all conditions. The design is considered most applicable under conditions where numerous presentations are not desired since they may result in boredom, fatigue, or related variables that may adversely affect the evaluation of the dependent variables. Spelling and reading deficits were treated in the present study, but only as a means of illustrating the experimental design.