The Jargon File (version 4.4.7, 29 Dec 2003):
KISS Principle
 /kis' prin?si?pl/, n.
    ?Keep It Simple, Stupid?. A maxim often invoked when discussing design to
    fend off creeping featurism and control development complexity. Possibly
    related to the marketroid maxim on sales presentations, ?Keep It Short
    and Simple?.
The Free On-line Dictionary of Computing (30 December 2018):
KISS Principle
   /kis' prin'si-pl/ Keep It Simple, Stupid.
   A maxim often invoked when discussing design to fend off
   creeping featurism and control complexity of development.
   Possibly related to the marketroid maxim on sales
   presentations, "Keep It Short and Simple".
   See also Occam's Razor.
   [Jargon File]
   (1994-11-18)