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KISS in Agile stands for Keep it simple Stupid
This applies to everything from planning, to design to development.
Do the simplest thing possible.
Don’t make it up.
Keep it simple
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Agile Practitioners Guide 
Hello,
The KISS principle is mentionned in Eric Raymond, New Hacker dictionary and therefore predates agile.
See http://www.ccil.org/jargon/jargon_26.html#SEC33
The corresponding XP practice is Simple design.
Cheers,
Philippe