The First Episode Psychosis Services Fidelity Scale (FEPS-FS 1.0) is used to assess the degree to which mental health teams deliver specialized care to people experiencing a first episode psychosis. Comprising of a range of evidence-based practices, FEPS-FS 1.0 can be used as an outcome measure for implementation research or as a quality measure for assessing structure and process indicators in health care. First Episode Psychosis Services Fidelity Scale Manual lays out FEPS-FS 1.0 and provides a practical guide for scoring an FEPS program against the criteria set out in the fidelity scale. It is designed to increase the reliability and consistency of ratings across different sites and assessors. The book includes the full First Episode Psychosis Services Fidelity Scale, a definition and rational for each component of FEPS-FS 1.0, a list of data sources to inform the ratings for each component, and decision rules to help score each component correctly. It also includes site interview data-collecting tools including interview guides, a health record abstraction guide, and a site fidelity assessment preparation guide.