Definitely agree with this from the 10 Things I Wish Lean Practitioners Wouldn’t Say in 2010 (via the Lean Blog):
7. “If you can’t measure it, you can’t manage it.”
I don’t believe that statement. I think this phrase should be avoided and it certainly shouldn’t be attributed to Dr. W. Edwards Deming, as it often is mistakenly. Dr. Deming never said this and he, in fact, meant quite the opposite. Some of the most important factors in a system are very difficult, even impossible, to measure. That doesn’t mean you can’t try to manage them. John Hunter, friend and fellow blogger, has the definitive take definitive blog take on this here…
Don’t get me wrong. Metrics are important but they aren’t always most important.