This document is a HIRMEOS project deliverable. The main objective of the HIRMEOS project is to improve five important publishing platforms for the open access monographs in the social sciences and the humanities and enhance their technical capacities and services, rendering technologies and content interoperable and embedding them fully into the European Open Science Cloud. The objective of the Certification service is to certify open access (OA) book publishers, based on their publishing practices. The service is intended to certify publishers at publisher level and at the level of individual publications. The objective within the HIRMEOS project is to implement the service for publishers that make use of the publishing platforms of project partners (OpenEdition Books, Ubiquity Press, Göttingen University Press, EKT Open Book Press and OAPEN). The Certification service is provided by the Directory of Open Access Books (DOAB), which is operated by OAPEN. Deliverable 4.1, Governance and quality assurance of service, provides a set of procedures and measures to manage the OPERAS Certification service.