Essentially, all models are wrong, but some are useful.

George E. P. Box (b. 1919) Anglo-American statistician, quality scientist [George Edward Pelham Box]
Empirical Model Building and Response Surfaces (1987) [with N. R. Draper]

As written on p. 424; earlier in the book (p. 74), it is given as: "Remember that all models are wrong; the practical question is how wrong do they have to be to not be useful."
Added on 1-Feb-04 | Last updated 2-Dec-13
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