RT info:eu-repo/semantics/article T1 Toward a better “Person–Environment Fit” through items calibration of the SIS-C A1 Arias González, Víctor Benito A1 Amor, Antonio M. A1 Verdugo Alonso, Miguel Ángel A1 Fernández, María A1 Arias Martínez, Benito A1 Aza, Alba K1 Psicología K1 Discapacidad intelectual K1 Supports intensity scale (SIS) K1 Support needs assessment K1 Social-ecological model of disability K1 Apoyo escala de intensidad (SIS) K1 Evaluación de las necesidades de apoyo K1 Modelo socioecológico de la discapacidad K1 3201.05 Psicología Clínica AB 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. PB MDPI YR 2020 FD 2020 LK https://uvadoc.uva.es/handle/10324/58915 UL https://uvadoc.uva.es/handle/10324/58915 LA eng NO Int. J. Environ. Res. Public Health, 2020, vol.17, n. 10, 3471 NO Producción Científica DS UVaDOC RD 23-may-2024