The principle of simplicity, of equality for the principle of Kayes (KISS principle). KISS IS for words, Keep it simple, Stupid! That by Kelly Johnson {Kelly Johnson} was expressed. Different, that for this an acronym is listed, include the following phrases are:
keep it short and simple
keep it simple and stupid
keep it simple and straitforward
keep it simple sir
keep it simple or be stupid
keep it simple and sincere

the principle simply states that most systems, if simple, and to get away from the complexity of the Commons. a better performance will be. So simplicity should be the primary goal, system design, and is of complexity, in vain avoided.