A program that allowed users to draw on a screen with a {light pen}. It supported constraints (e.g. drawing a constrained ellipse produced a circle). It also had some {computer aided design} features (e.g. computing loads on beams). Sketchpad was the subject of Ivan E. Sutherland' s 1963 MIT PhD thesis, which opened the field of computer graphics. It was the progenitor of computer drawing packages like MacDraw or Adobe Illustrator. There is a film of Sketchpad in action. It solved constraints using value inference and introduced the "ring" list structure. ["Sketchpad: A Man-Machine Graphical Communication System", I.e. Sutherland, MIT Lincoln Lab, TR 296 (Jan 1963)]. [Sammet 1969, p. 678]. (1995-02-14)

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