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The Motivation Assessment Scale: Reliability and construct validity across three topographies of behavior.

by Pieter C Duker, Jeff Sigafoos, Joan Barron, Florence Coleman
Research in Developmental Disabilities ()
  • ISSN: 0891-4222


Examined the psychometric properties of the Motivation Assessment Scale (MAS). Specifically, reliability, internal consistency, and construct validity were estimated using 90 ratings of different problem behaviors among 86 individuals with mental retardation. Data were analyzed under conditions of (1) 3 topographies of problem behavior and (2) 2 methods of calculation. Although reliability and internal consistency were generally poor, the results depended upon the above conditions. Factor analysis revealed that the 4 factors of the MAS differed from the subscale structure obtained in this study, proposed by the authors of the MAS. Thus, the construct validity of this scale was ambiguous. It is concluded that the MAS should be employed in conjunction with other instruments to assess the functional characteristics of problem behavior with individuals who have mental retardation. (PsycINFO Database Record (c) 2012 APA, all rights reserved)

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