Newtonian manager of the 90s:

"WAIT ✋! If specifications are well defined and we have a detailed plan, we can do this within a project and track the progress with surgical precision."

Newtonian manager of the 90s gets C.
C stands for crap.

Newtonian manager of the 90s thought there was no need for adaptation along the way.

He will soon have to adapt his own framework with contraptions like phased projects or intermediate deliveries to suit the nature of reality:

Short feedback loops adapt better.