"Trade off analysis." . . "Learning." . . "Intelligibility." . . "Semantics." . . "Embedding." . . "Heuristic methods." . . "Integrated systems." . . . . . . . . . "A Principled design for an integrated computational environment"@en . . . . . . . "A Principled Design for an Integrated Computational Environment"@en . . "A principled design for an integrated computational environment"@en . . . . . "Boxer is a computer language designed to be the base of an integrated computational environment providing a broad array of functionality -- from text editing to programming -- for naive and novice users. It stands in the line of Lisp inspired languages (Lisp, Logo, Scheme), but differs from these in achieving much of its understandability from pervasive use of a spatial metaphor reinforced through suitable graphics. This paper describes a set of learnability and understandability issues first and then uses them to motivate design decisions made concerning Boxer and the environment in which it is embedded."@en . . . . . . . . . . . . . "MASSACHUSETTS INST OF TECH CAMBRIDGE LAB FOR COMPUTER SCIENCE." . . "Computer Programming and Software." . . "Computer graphics." . . "Man machine systems." . . "Programming languages." . . "Benutzerfreundlichkeit." . . "Programmiersprache." . . "Man computer interface." . . "Decision making." . . "Human Factors Engineering & Man Machine System." . . . . "User needs." . . "Synergism." . . "Experimental design." . .