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Due to the difficulty of modeling the manufacturing deviations reliably, the existing geometric models, to date, have only con sidered the exact description of parts and assemblies. Yet, the tolerance representation and propagation issues in assemblies are crucial to answer parallel design of product and process queries. Many formal and informal methods have been developed. However, most proved special cases of the ANSI Y14.5M-82 specification standard. Also, the descriptions provided in actual solid and feature based de sign modelers are inadequate to ascertain a clear taxonomy of tolerance specifications, neither do they help address the assembly toler ance analysis and/or synthesis issues.

The paper purposes to discuss the tolerance representation schemes as well as their underlying philosophies. Then, because toler ance analysis and tolerance synthesis in assemblies are required, among other tasks, to assign functional tolerances, measure the manufacturability and the interchangeability of parts in assemblies, ease tolerance inspection and evaluate costs of alternative assembly sequences, we shall assess deterministic and statistical methods.

26:T437,

According to conceptual changes on design methodology, this paper presents some research results on a new generation of CAD systems. This new software has not been used to achieve automatic design tasks. On the contrary, it has to make part of an inte grated design environment.

A cooperative design modeler is then presented as a support for cooperative and integrated design methodology in this design envi ronment. It mainly allows every design actor to share a unique database owing to a formal exchange network. The modeler provides a graphic interface to add, edit, or modify data. Moreover, the modeler manages the shared database in order to realize heavy design tasks as data propagation or data coherence management.

The presented modeler takes place in the global design environment connected to specific applications based on specific design tasks (process planning, structure analysis). An informal communication network worthwhile in any design group including human actors also assists the cooperative design modeler.

27:T4cf,

Concurrent Engineering (CE) approaches heavily rely on efficient and reliable communications among people involved in the design, engineering, industrialisation and even manufacturing of products. One important aspect of Concurrent Engineering concerns common resolution of product design problems within a CE integrated team. This involves exchange of technical messages (information) and capitalisation of relevant knowledge. The aim in this