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A conventional system allows a user to provide inputs that produce outputs. A constraint-oriented system, such as ThingLab, allows the user to provide arbitrary inputs or outputs, then solves for whatever is unknown. ThingLab is viewed as one of the earliest constraint-oriented systems.[according to whom?]
ThingLab is credited in "Fumbling the Future" as a big reason Xerox continued to fund computer development.
- ThingLab Sources
- ThingLab - A Constraint-Oriented Simulation Laboratory
- ThingLab Demonstration Video Presented at The Computing Form, Xerox PARC, June 1978. (QuickTime Movie File)
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