Participatory research has been developed since the 1980s in agriculture. What are its performances and limits in the agricultural condition of countries of the South? This study proposes an evaluation grid for the characteristics and performances of 12 Cameroonian participatory action research projects in partnership. It shows that these approaches increase taking account of farmers’ expectations and actors’ competences. It also shows that asymmetries between researchers and farmers, requirements of the different steps of the process, and the necessity to work on long time space limit performances.