This paper is a proposal for the anthropological analysis of the cargo system, including both indigenous and non indigenous communities. From the understanding of the cargo system as an essentially heterogeneous institution, the paper suggest as main hypothesis that this institution is the origin of other mechanisms in the interaction of the members of the communities. First, the community institutions promote the participation of the largest number of people. Second, interactions' scenes are constantly created and recreated by the community members. Third, the roles' rotation, as a product of a tacit agreement into community members, is fundamental to assure social participation. The proposal is structured in three parts. First, the composition of the cargo system as a continuum which explains the differences between individual and collective behaviour. Second, the idea of community as a fundamental concept to understand the cargo system. As a conclusion, the idea of communitarian project becomes the common characteristic of all the communities -native or no native- in the Mesoamerican area. [ABSTRACT FROM AUTHOR]