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The "keep it simple stupid" (KISS) principle is a design rule that states that systems perform best when they have simple designs rather than complex ones. KISS is not meant to imply stupidity. On the contrary, it is usually associated with intelligent systems that may be misconstrued as stupid because of their simplistic design. The KISS Principle hinders and/or prevents creeping featurism, system failover and other IT issues.
KISS is also an acronym for "keep it short and simple" and "keep it simple and straighforward".
Kelly Johnson formulated the KISS principle in the mid-1900s while working as an engineer for the Lockheed Skunk Works, Lockheed Martin's advanced aircraft development program.
Johnson coined the KISS principle during a long engineering career of designing systems with simple repair capabilities, using tools and skills used by average mechanics. Today, this term is frequently used in software design, where function creep and instruction creep can make programs unmanageable over time.
The KISS principle is similar to older concepts: