The KISS principle is "Keep It Simple, Stupid". It is an acronym, with the letters KISS making the beginnings of the important words. It was used as a principle for design by the U.S. Navy in 1960. The phrase is said to have been first used by Kelly Johnson, lead engineer at the Lockheed Skunk Works.
- The Routledge Dictionary of Modern American Slang and Unconventional English, Tom Dalzell, 2009, 1104 pages, p.595, webpage: BGoogle-5F: notes U.S. Navy "Project KISS" of 1960, headed by Rear Admiral Paul D. Stroop, Chicago Daily Tribune, p.43, 4 December 1960.
- Clarence Leonard (Kelly) Johnson 1910—1990: A Biographical Memoir Archived 2012-10-21 at the Wayback Machine (PDF), by Ben R. Rich, 1995, National Academies Press, Washington, DC, p. 13.
- "Kiss principle definition by MONASH Marketing Dictionary". Dictionary.babylon.com. 1994-11-18. Archived from the original on 2010-04-05. Retrieved 2010-04-18.
- "Kiss Principle".