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By Prof. Dr. José Encarnação, Dr. Ernest G. Schlechtendahl (auth.)

4 lation and optimization. those are crucial elements of the iterative approach, resulting in a possible and, one hopes, optimum layout. 1.3 content material of the booklet In bankruptcy 2 we current in brief the historical past of CAD. the most elements of CAD structures are pointed out, and their valuable capabilities defined. Economi­ cal and interdisciplinary points are mentioned. bankruptcy three starts off with a platforms research of the layout technique. The suggestion of a technique is brought as a basic instrument to explain actions like layout as an entire, computer-aided layout, application executions, terminal classes and so on. the surroundings and the assets which the surroundings needs to offer for the profitable execution of any procedure are mentioned. the matter of modelling the layout gadgets in an summary schema and the interrelation among the schema and the making plans of the person step within the layout are analysed. bankruptcy four concentrates at the interfaces one of the parts of a CAD process, together with the human operator. the matter of mapping an summary schema onto the functions of assorted programming, command, or facts de­ scription languages is defined intimately. Emphasis is laid upon the source element and its effect at the layout of CAD platforms. the concept that of a CAD software program laptop is brought, and principles for designing such machines are given.

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For long-running and large-scale design projects the specification cannot be assumed to remain constant. The specification may not only be developed in more detail, but may actually be changed. As an example new environmental protection laws becoming effective during the design period of a chemical plant will affect the specification. The design process must involve precautions to accommodate such specification changes (at least to a certain extent). The design specification may be influenced not only by such external forces.

34] P. Bono, J. A. Hopgood, P. ten Hagen: GKS - The First Graphics Standard. IEEE Computer Graphics and Applications 2 (1982) 5, pp. 9-23. [35] R. Kessener, J. Michener, G. Pfaff, D. Rosenthal, M. Sabin: The Detailed Semantics of Graphics Input Devices. IEEE Computer Graphics and Applications 2 (1982) 4. [36] J. Encarnayao, G. Enderle, K. Kansy, G. G. Schiechtendahi, J. WeiB, P. WiBkirchen: The Workstation Concept ofGKS and the Resulting Conceptual Differences to the GSPC Proposa!. Proc. SIGGRAPH '80, Computer Graphics 14 (1980) 3, pp.

3 Design Processes and Design Environments The aspects of learning and environment introduced in the previous paragraph lead to a further refinement of our design process model, which is represented in Fig. 4. Here we do not show the control loop relationships between the various tasks (which were the key aspect in Fig. 3). We simply show that synthesis, analysis, evaluation, and representation all operate on the same set of information which we call the "knowledge" associated with the design process for a given product.

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