The OECD report Innovative Citizen Participation and New Democratic Institutions: Catching the Deliberative Wave (2020) demonstrated that public authorities from all levels of government increasingly turn to Citizens' Assemblies, Citizens’ Juries, and other representative deliberative processes to tackle complex policy problems. As the use of such processes increases, so does the need to determine and ultimately improve their quality. The purpose of this document is to help public authorities initiate and develop better representative deliberative processes by establishing a minimum standard for their evaluation. These guidelines provide policy makers and practitioners with an evaluation framework and methodology, as well as evaluation questionnaires.