Toward a Better “Person–Environment Fit” through Items Calibration of the SIS-C

Víctor B. Arias, Antonio M. Amor, Miguel A. Verdugo, María Fernández, Benito Arias and Alba Aza
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Víctor B. Arias: Institute on Community Integration, Department of Personality, Assessment and Psychological Treatments, Faculty of Psychology, University of Salamanca, 37005 Salamanca, Spain
Antonio M. Amor: Institute on Community Integration, Department of Personality, Assessment and Psychological Treatments, Faculty of Psychology, University of Salamanca, 37005 Salamanca, Spain
Miguel A. Verdugo: Institute on Community Integration, Department of Personality, Assessment and Psychological Treatments, Faculty of Psychology, University of Salamanca, 37005 Salamanca, Spain
María Fernández: Institute on Community Integration, Department of Personality, Assessment and Psychological Treatments, Faculty of Psychology, University of Salamanca, 37005 Salamanca, Spain
Benito Arias: Institute on Community Integration, Department of Psychology, Faculty of Education and Social Work, University of Valladolid, 47011 Valladolid, Spain
Alba Aza: Institute on Community Integration, Department of Personality, Assessment and Psychological Treatments, Faculty of Psychology, University of Salamanca, 37005 Salamanca, Spain

IJERPH, 2020, vol. 17, issue 10, 1-17

Abstract: The Supports Intensity Scale–Children’s Version (SIS-C) is the only available tool to assess extraordinary support needs for children and adolescents with intellectual disability. In past years, several works have proclaimed the need for its ongoing improvement as a measurement instrument. To contribute to this line of research, the goal of this work is to analyze the reliability of the SIS-C and its usefulness to distinguish between different levels of intensity of support needs. To address this, 814 children and adolescents with intellectual disability (M = 11.13 years; SD = 3.41) were assessed using the SIS-C Spanish version. Item response theory analyses were conducted to estimate latent scores and assess measurement quality along the support needs continuum. The SIS-C items showed good overall discrimination and information values, and none showed problems that required their removal or modification. However, all the scales composing the SIS-C showed problems in discerning high levels of intensity of support needs, especially for children and adolescents with severe/profound intellectual disability. This ceiling effect may be an obstacle for both research and practice involving the SIS-C. Implications for research and practice are discussed, and future lines of research for improving the SIS-C are provided.

Keywords: context-based intervention; social-ecological model of disability; person–environment fit; supports paradigm; support needs; support needs assessment; quality of life; rights; Supports intensity scale (SIS) (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2020
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