Renorming the Supports Intensity Scale-Adult Version: Evaluating the Impact of Updated Norms on Scores.

The Supports Intensity Scale-Adult Version (SIS-A) measures the intensity of support needs of people aged 16 and over with intellectual and developmental disabilities. Since its 2004 release, this tool has informed supports planning across the United States and internationally. In 2023, the second edition of the SIS-A was published, featuring updated norms for the scale. This study examines the alignment of score distributions before and after renorming the SIS-A. Findings reveal a strong correlation between scores derived from the original and updated norms, suggesting continuity in score distributions. However, the use of the updated norms resulted in a more normal distribution of scores. Implications for research, policy, and practice are discussed.