The most important, and ...

The most important, and indeed the truly unique, contribution of management in the 20th century was the fifty-fold increase in the productivity of the MANUAL WORKER in manufacturing. The most important contribution management needs to make in the 21st century is similarly to increase the productivity of KNOWLEDGE WORK and the KNOWLEDGE WORKER.
The most important, and indeed the truly unique, contribution of management in the 20th century was the fifty-fold increase in the productivity of the MANUAL WORKER in manufacturing. The most important contribution management needs to make in the 21st century is similarly to increase the productivity of KNOWLEDGE WORK and the KNOWLEDGE WORKER.

Quotes from the same author

The entrepreneur always searches for change, responds to it, and exploits it as an opportunity.
Efficiency is doing things right; effectiveness is doing the right things.
The best way to predict your future is to create it.
There is nothing so useless as doing efficiently that which should not be done at all.
Follow effective action with quiet reflection. From the quiet reflection will come even more effective action.