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## General Remarks on the Concept Man - Machine - Interface of SISCAD-P

SISCAD-P works with an easy-to-use command language with the help of which the user creates his data. The following diagram shows how to create CAD commands as well as the processing of them.

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- Core of program :

  Administration of program data, mathematical calculations, manipulator etc.

- Modules :

  Modules enabling the user to see at any time - in accordance with the WYSIWYG-principle - which results are to be expected because of the inputs made.

- Interpreter :

  Module for processing CAD commands.

- Interface :

  Window - interface, which the user controls with keyboard and mouse. The user may put in CAD commands directly. Apart from that all actions which influence the data belonging to the core construction are handed over to the interpreter as CAD commands.

- Macros :

  Files containing a sequence of CAD-commands, which are executed by the system one after the other.