AbstractThe high tree species diversity in tropical forests is difficult to take into account in models. The usual solution consists of defining groups of species and then adjusting a set of parameters for each group. In this study, we address this issue by allowing a species to move from one species group to another, depending on the biological process that is concerned. We developed this approach with a matrix model of forest dynamics, for a tropical rain forest in French Guiana, at Paracou, focusing on the methodological aspects. The forest dynamics was split into three components: recruitment, growth and mortality. We then built five recruitment groups, five growth groups and five mortality groups. One species was characterized by a combination of the three groups, thus yielding in total 5×5×5=125 possibilities, out of which 43 were actually observed. The resulting matrix model provided a better view of the floristic composition of the forest, and did not have more parameters than it would have with five global species groups. However, its predictions were no more precise than those of the matrix model based on five global groups.