I seem to recall that Herbert Simon borrowed the term from computer science, but I cannot remember the initial paper in which he made use of this borrowing.

A google scholar search reveals some papers from 1957-1958, for instance [this one](http://www.u-picardie.fr/~furst/docs/Newell_Simon_Heuristic_Problem_Solving_1958.pdf), but I really felt there was something from earlier in the 1950s.