The model coupling problem: methods used in some building analysis tools and the almeth propositions

The model coupling problem (MCP) is a general non trivial problem raised by the universal choice of modularity as a conceptual base for object programming and search for efficiency in software tools development. Despite the apparent universality of the problem, it does not lead to a clear common formulation; on the contrary numerous "schools" of developers seem to dig gaps among the IBPSA community. We explore in this paper the origin of the misunderstanding, and propose a tentative conceptual tool aiming towards an international comprehensive articulation of BPSA projects.