DWIM ("Do What I Mean") computer systems attempt to anticipate what users intend to do, correcting trivial errors automatically rather than blindly executing users' explicit but incorrect input. The term was coined by Warren Teitelman in his DWIM package for BBN Lisp, part of his PILOT system, some time before 1966.
Teitelman and his Xerox PARC colleague Larry Masinter later described the philosophy of DWIM in the Interlisp programming environment (the successor of BBN Lisp):
Although most users think of DWIM as a single identifiable package, it embodies a pervasive philosophy of user interface design: at the user interface level, system facilties should make reasonable interpretations when given unrecognized input. ...the style of interface used throughout Interlisp allows the user to omit various parameters and have these default to reasonable values...
DWIM is an embodiment of the idea that the user is interacting with an agent who attempts to interpret the user's request from contextual information. Since we want the user to feel that he is conversing with the system, he should not be stopped and forced to correct himself or give additional information in situations where the correction or information is obvious.
Critics of DWIM claimed that it was "tuned to the particular typing mistakes to which Teitelman was prone, and no others" and called it "Do What Teitelman Means" or "Do What Interlisp Means."
Emacs has a function
comment-dwimthat comments out a selected region if uncommented, or uncomments it, when already commented out.
- ^ Warren Teitelman, "PILOT: A Step towards Man-Computer Symbiosis", M.I.T. Ph.D. Dissertation, Project MAC MAC-TR-32, September 1966. DTIC AD0638446 PDF, p. 51
- ^ a b Warren Teitelman, "Toward a programming laboratory", in J.N. Buxton and B. Randell, Software Engineering Techniques, April 1970, a report on a conference sponsorted by the NATO Science Committee, Rome, Italy, 27-31 October 1969, p. 108ff.
- ^ Donald E. Walker, Lewis M. Norton (Eds.): Proceedings of the 1st International Joint Conference on Artificial Intelligence, Washington, DC, p 715, May 1969.
- ^ Warren Teitelman, Larry Masinter, "The Interlisp Programming Environment", Computer (IEEE) 14:4:25-33, April 1981. doi:10.1109/C-M.1981.220410 pdf
- ^ Guy L. Steele Jr., Richard P. Gabriel, "The Evolution of Lisp", in History of programming languages---II, 1996, ISBN 0-201-89502-1 doi:10.1145/234286.1057818, p. 16. pdf
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