Borning, Alan "ThingLab - A Constraint-Oriented Simulation Laboratory" Xerox PARC Report SSL-79-3 July 1979

Languages mentioned

• ABSET {1970} Set-based language
• Constraint Algol {1964} Algol 60 with constraints
• CONSTRAINTS {1978}
• KRL {1977} Knowledge Representation Language
• REF-ARF {1970}
• Sketchpad {1962} Interactive graphics environment
• Smalltalk-80 {1980}
• ThingLab {1979}