The Effective Executive
Purchase the Book
The greatest management book ever written.
The Greatest Management Book Ever Written.
Drucker delivers here the most powerful and simple insight every manager must know - one's time is one's scarcest resource. This is a slim volume, and the best value on the list. You may quibble with Drucker's insights on meetings, but it doesn't matter - just the first 50 pages are worth 5 years of management development training.
Read this book once a year.