Abstract
One assessment instrument that was developed to evaluate the motivational factors that may instigate or maintain challenging behaviors in persons with developmental disabilities is the Motivation Assessment Scale (MAS) (Durand & Crimmins, 1992). Although the MAS is increasingly being used in applied settings, questions remain concerning its reliability and validity (Crawford, Brockel, Schauss, & Miltenberger, 1992). The purpose of this research study was to further assess the intra-rater and inter-rater agreement of the MAS and expand the results of previous research by evaluating this across additional time and administrations. A total of 20 persons with mental retardation and 19 raters participated in the study. The results indicated variable moderate-low intra-rater and inter-rater reliability. Conclusions and the need for future research are discussed.
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