Word:

Sketchpad

Sketchpad - 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].
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Skep
skepful
Skeptic
skeptical
skeptically
Skepticism
Skepticize
Skerry
Sketch
sketch block
sketch map
sketch pad
Sketchbook
Sketcher
Sketchily
Sketchiness
-- Sketchpad --
Sketchy
Skew
skew arch
Skew back
Skew bridge
skew correlation
Skew curve
Skew gearing
Skew pantograph
Skew surface
Skew symmetrical determinant
skew-eyed
skew-whiff
Skewbald
skewed
Skewer
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