Computer-aided design and drafting involves creating computer models defined by geometrical parameters derived after the design analysis and evaluation process. Computer-aided manufacturing uses these geometrical design data to control automated machinery. Computer aided manufacturing systems are associated with computer numerical controller direct numerical control systems. Computer aided design and manufacturing is adopted to increase the productivity of the designer, improve the quality of design, improve communications through documentation and to create a database for manufacturing prototypes, finished products, and production of the actual product. An integrated CAD/CAM system offers one complete solution for design through manufacturing.