[argiopetech]

Drucker never actually said that, though it's been attributed to him frequently. I found this blog interesting, and they link to the Drucker Institute if you'd like something more authoritative.

https://medium.com/centre-for-public-impact/what-gets-measur...

Similar quotes are often attributed to Deming. He never make this claim either.

[BrianOnHN]

I suppose I confused this with "Know Thy Time" in Effective Executive. Thanks for clarifying, I'm sure I've incorrectly made this attribution before.

Edit: typo