Part I The Participatory Prospective Analysis (PPA) Method The philosophy of the PPA method Methodological components Presentation of the method Definition of the system's limits Identification of variables Selection and definition of key variables Mutual influence analysis Interpretation of influence/dependence links Definition of the states of variables Building scenarios Using scenarios Implementing the PPA Equipment and resources Organizing group work The question of experts and expertise Part II The PPA Method at Work: The Case of Secondary Crop Research and Development Prospects in Asia and the Pacific Context Organization of the PPA System identification Creation of a working group and workshop organization Process and results Identification of key variables Influence/dependence analysis Building scenarios Analysis of implications Conclusion Key Words: decision making, analytical methods, tools