O'Reilly, Mark F.2016-07-182018-01-222016-07-182018-01-222016-05May 2016http://hdl.handle.net/2152/39124This experiment evaluated the differential effects of three Multiple Stimulus With Replacement preference assessment variations on the motivation of four participants with developmental disabilities to respond to a mastered task. No discernible difference was demonstrated between the Five Pre-Session Choices condition and the Five Within-Session Choices conditions, suggesting that the timing of choice opportunities did not affect motivation, demonstrated through lack of differentiation in a multi-element experimental design for the dependent variables of Latency to Task Initiation, Total Task Duration, Percentage Correct Responding, or No-Responses. Subsequently, a One Pre-Session Choice condition was initiated to evaluate the efficacy of a preference assessment method with lower practitioner response effort. The introduction of this condition also resulted in undifferentiated data. Implications and future research are discussed.application/pdfenPreference assessmentMotivationThesis2016-07-18