KISS is an acronym for "Keep it simple, stupid" as a design principle noted by the U.S. Navy in 1960.[1][2] The KISS principle states that most systems work best if they are kept simple rather than made complex; therefore simplicityshould be a key goal in design and unnecessary complexity should be avoided. The phrase has been associated with aircraft engineer Kelly Johnson (1910–1990).[3] The term "KISS principle" was in popular use by 1970.[4] Variations on the phrase include "keep it stupid simple", "keep it short and simple", "keep it simple sir", "keep it super simple", "keep it simple or be stupid", "keep it simple and stupid", "keep it simple and straightforward", "keep it simple and safe", "Keep it simple student", "keep it simple, silly", "keep it simple and sincere" or "keep it simple and secular."[5][6]
Origin[edit]
The acronym was reportedly coined by Kelly Johnson, lead engineer at the Lockheed Skunk Works (creators of the Lockheed U-2 and SR-71 Blackbird spy planes, among many others).[3]
While popular usage has translated it for decades as, 'Keep it simple, stupid', Johnson translated it as, 'Keep it simple stupid' (no comma), and this reading is still used by many authors.[7] There was no implicit meaning that an engineer was stupid; just the opposite.[3]
The principle is best exemplified by the story of Johnson handing a team of design engineers a handful of tools, with the challenge that the jet aircraft they were designing must be repairable by an average mechanic in the field under combat conditions with only these tools. Hence, the 'stupid' refers to the relationship between the way things break and the sophistication available to fix them.
The acronym has been used by many in the United States Air Force and the field of software development.
Variants[edit]
The principle most likely finds its origins in similar concepts, such as Occam's razor, Leonardo da Vinci's