The research reported in this article investigated the psychometric characteristics of the Independent Living Skills Survey (ILSS), a comprehensive, objec-tive, performance-focused, easy-to-administer measure of the basic functional living skills of individuals with severe and persistent mental illness (SPMI). Two ver-sions were developed, one for informants and one for self-report. Data from three research projects were analyzed to determine the versions ' internal consis-tency, stability, interrater reliability, sensitivity to the effects of skills training, and concurrent and predictive validity. The results indicated that the two versions have acceptable psychometric characteristics, and sug-gestions are offered for their use in planning individu-alized treatment, evaluating programmatic services, and determining eligibility for benefits
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