Computer aided design. Image made by a computer aided design (CAD) package of an Audi 100 car, shown as a wire frame drawing on the left and a volume drawing on the right. The surface of the vehicle is described as a set of interlocking polygons, which on the volume drawing are filled in. CAD is an increasingly powerful tool in the design of many common products, as design changes may be quickly incorporated into the model. Pre- computer age techniques involved the labour- intensive carving of wooden mock-ups of designs from paper technical drawings. CAD packages may be integrated with production machinery in computer aided manufacture (or CAD/CAM) systems.

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