This practical French-language guide addresses the full cycle of organizing and running effective meetings, from preparation through participation. It treats meetings as structured work situations requiring clear objectives, appropriate methods, and active engagement from everyone involved. The book offers guidance for facilitators and participants on setting agendas, clarifying roles, managing group dynamics, encouraging contributions, and turning discussion into concrete outcomes. Its focus on workshops and working groups makes it relevant for trainers, team leaders, project coordinators, and anyone responsible for improving collaboration in professional or educational settings. By emphasizing preparation and facilitation techniques, it helps readers make meetings more purposeful, inclusive, and productive while reducing confusion and wasted time. The text is presented as a practical manual, with concepts that can be applied to recurring team meetings, project workshops, and collaborative decision-making sessions.