Considering the needs of siblings is an important component of family-centered practice for children with developmental disabilities. A syntactically and semantically simplified version of the "Sibling Need and Involvement Profile" (SNIP) was developed to allow self-report. Total profile scores for the self-report version correlated well with the original (Spearman's rho = 0.928, p less than 0.01), and test-retest reliability was good (Spearman's rho = 0.896, p less than 0.01). Children who piloted the instrument demonstrated good understanding of the vocabulary and the intent of the questions; however, using the instrument with adult supervision is suggested. A comparison of children's self-report scores to those of their parents' resulted in low, insignificant correlations, suggesting that parents' and children's perspectives do not always agree. Multiple measures, including sibling self-report and parent reports, are necessary for accurate determination of sibling need and involvement. (Contains 5 tables.)