Abstract:This paper presents a computer‐aided construction process program based on a heuristic research knowledge‐based system, logical procedures for constraints propagation, as well as on operational research algorithms. The system is interactive: it is the user, not the program, who controls the heuristic research. Furthermore, it is graphics oriented: a reflexive architecture between the knowledge‐based system and a geometrical modeller allows permanent graphic visualization of the work in progress. The application presented includes a variety of operations, ranging from the geometric modelling of the architectural project to the intelligent analysis of its structure, its division into component types (e.g. shuttering posts, beams, floors, walls) and the planning of the construction process (production cycles, tasks scheduling).Tested by engineers of a private international building company, the system has now received new implementations, which allow us to simulate different technologies and modify very rapidly many various parameters, thus giving to the users a real computer‐aided construction process envi