In this work, we present a set of proposals for the definition of a generalised multimedia information system. The system supports production of scenes using techniques of the declarative modelling by hierarchical decomposition. These proposals include a declarative design process model, the corresponding user needs and define information system framework. The resulting software system architecture is also presented and a prototype of it is implemented. The whole system named MultiCAD is developed as a joint project between laboratory MSI of the University of Limoges and the Information systems and applications Group of the TEI of Athens. Keywords: computer graphics, CAD, conceptual modelling, design process, design knowledge representation, multimedia information systems, knowledge-based systems, decision support systems. 1.