This research is a policy evaluation of the mission of setting up health promotion programmes in French-speaking Belgium, following a participatory approach structured around process-tracing, bringing together more than health and school practioners. The results show a great variations in the implementation in terms of funding, staffing, context, realization, reporting and visions of the content of the mission. The report notably recommends to review the funding of the policy, to support paradigmatic change towards health promotion, to help the health in school sector to gain legitimacy in the school context and to revise policy managerial and reporting tools.