① Computer aided design (CAD) It have been associated with computer system design with the development of the concept of computer-graphics but the concept of computer design, than a lot of computer graphics in terms of analysis and modeling.. however, the Interactive Computer Graphics (ICG) is a technical base necessary for computer system design.

The term computer design, which referred to short letters of CAD, including any design process using computers to develop, or analyze, or modify the design engineering firm. It could be argued that the computer system design (CAD) consists of two important elements : 1 - (Interactive Computer Graphics : ICG) ~ and this term refers to (hardware) and (software) used by the designer to create drawings and designs..

A (hardware) includes CPU, peripherals and which contains the telescope, and means of entry and other equipment such as a printer and plotter. The (software) include group programs that facilitate the completion of the required engineering jobs such as drawing, engineering analysis Etc..

2 – User:or the designer, which is the second important component of computer system design, where the interactive computer graphics is only a tool used by the designer to solve the problem of design..

There are many reasons for the use of computer systems design, including : 1 - increase productivity 2 - Quality Improvement 3 - standardization of language and exchange dealing 4 - Tauferhadp Extensive data for the manufacturing process And can be summed up the role played by the computer in the design process as follows : (1) geometric modeling (2) engineering analysis (3) to review and evaluate design (4) Automated drawing

As is clear from the definition of manufacturing application the computer can be limited to two groups: 1 - command and control computer : Includes direct applications in which they are directly linked to computer manufacturing operations, in order to control and process control. : 2 - applications support manufacturing - Programming of numerical control machines (NC) computer - Planning a computer-automated processes - Guess the standard time required for production operations. - Production scheduling - Planning of raw materials - Control of the workshops

In all these examples of human existence is absolutely necessary either to enter data for computer programs, or to interpret the output of the computer and used effectively in the appropriate.. Computer is not used here to control the process directly, but the operations are controlled by Group Operator, which follows the information supplied by the computer..