This document is a guide that outlines the criteria and processes for assessing multi-site organizations under a quality management system. It defines a multi-site organization as one with a central office responsible for managing activities across various local sites. The guide specifies eligibility criteria for assessment, emphasizing that sites must operate under similar processes and procedures. It details the responsibilities of the central function, including data collection and corrective action initiation. The document also discusses the limitations of multi-site sampling, highlighting that not all organizations qualify for this approach due to factors such as the variability of local factors and the complexity of operations. Additionally, it addresses the protocol for dealing with nonconformities identified during assessments and the issuance of certificates, which must reflect the status of all sites involved. The guide aims to ensure sufficient confidence in the effectiveness of the management system across all sites.