This guidance describes the methods and processes of the Strategic Advisory Group of Experts (SAGE) on Immunization in developing evidence-based recommendations, WHO vaccine position papers, and other immunization policy guidance. Its aim is to facilitate the work of SAGE, its working groups and the WHO Secretariat, as well as to inform a wider readership, such as national immunization managers and national immunization technical advisory groups. The document will be updated, as necessary, as the methodology for evidence-based decision making evolves.