By Jordan J. Cox (auth.), Pere Brunet, Christoph M. Hoffmann, Dieter Roller (eds.)

Systems to help the continually shrinking product improvement cycles and the expanding caliber specifications want major improvements and new approaches.
In this booklet vital new instruments and algorithms for destiny product modeling structures are provided. it's in response to a seminar on the foreign convention and learn middle for desktop technological know-how, Schloß Dagstuhl, Germany, awarded through the world over famous specialists in CAD technology.

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In this session, the process for knowledge formalization is described, focusing on user/system activity share and knowledge share. User/System Activity Share Human and computers co-operate in a problem solving process. Different levels of activity can be identified, that are related to the complexity of the process tasks. If we think of a human communicating with a computer, the level of activity accomplished tends to be very low. , are actually quite primitive, and basically concern the syntactic and lessicallevels of the interaction.

The level of performances provided is closely related to the level of interaction. The higher is the level of interaction, the lower is the number of interactions to be performed to complete a given task [Cug91]. The system can support the user, if some knowledge on the task domain, on the user interface and on the user himself has been formalized and is usable. In this session, the process for knowledge formalization is described, focusing on user/system activity share and knowledge share. User/System Activity Share Human and computers co-operate in a problem solving process.

In a following phase, parts and attributes, etc. can be detailed. According to that, design by assembly feature helps in supporting this kind of top-down reasoning, and this way of facing the problem of assembly design, that is closer to the way of thinking of an assembly and its components. Besides, a further activity concems the interaction with the international standards activities relative to feature and assembly (STEP), in order to contribute with concepts and requirements for feature and assembly.

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