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CADD stands for . By using the computer for the functions normally utilized by hand, a greater amount of efficiency can be attained. By drawing lines with a computer on a screen, corrections can be made without erasing the entire product. CADD is a lot like a ....

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.... which needed lots of human intervention to one program on a floppy disk. When the power of computers increased, so did the possibilities of CADD. Images on CADD systems are drawn with the aid of a keyboard, mouse, or tracking ball. One selects the starting point of a line, the ending point, and the line is drawn. A scale at the bottom of the screen tells how long the line will be. On some CADD systems, the computer itself can measure how long the line will be while the operator inputs the length of the line. Lines are the basis of all drawings. Straight lines are fairly simple and quick to make, but what about curved or wavy lines ....