Abstract
The purpose of this study was to test the reliability and validity of the First-Episode Psychosis Services Fidelity Scale (FEPS-FS) and compare it with similar scales. A fidelity scale was developed from previously identified essential components of first-episode psychosis services. The scale was tested in six programs in two countries and compared with three existing scales. Program data collection from multiple sources indicated the feasibility and reliability of the FEPS-FS (intraclass correlation coefficient for interrater reliability=.842; 95% confidence interval=.795-.882). Satisfactory programs scored an average of 86% of the maximum total score; the single unsatisfactory program scored 70%. Compared with the other scales, the FEPS-FS has fewer items, but it has the highest proportion of items common to all scales. The FEPS-FS is a feasible, compact, reliable, and valid measure of adherence to evidence-based practices for first-episode psychosis services that can be applied to any first-episode psychosis service.
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