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The aim of this study was to evaluate the intercorrelation between the Personal and Social Performance (PSP) score, cognitive function, and activities of daily living (ADLs). Twenty patients with chronic schizophrenia were recruited; the PSP and ADL scales and psychological assessments including the Wisconsin Card Sorting Test, the Wechsler Memory Scale-Revised (WMS-R), and the Continuous Performance Test (CPT) were administered. Positive correlations between the total PSP scale score and performance in the WMS-R, CPT, and ADL scores were identified. The PSP score was found to be of good reliability for cognitive function and ADL evaluation.