Didn't know it takes Project Director to give that advice. I always thought it is rather common sense, borne from experience: https://en.wikipedia.org/wiki/Nin

Didn't know it takes Project Director to give that advice. I always thought it is rather common sense, borne from experience: https://en.wikipedia.org/wiki/Ninety%E2%80%93ninety_rule https://en.wikipedia.org/wiki/Ninety%E2%80%93ninety_rule