This is not a textbook, of course—if only because effectiveness, while capable of being learned, surely cannot be taught. Effectiveness is, after all, not a ‘subject,’ but a self-discipline.
The Author of this Quote
![Peter F. Drucker](/_next/image?url=https%3A%2F%2Fassets.heroic.us%2Fauthors%2Fheadshots%2Fpeter-f-drucker.jpg&w=640&q=75)
Author
Peter F. Drucker
Management consultant, educator, author, and "the founder of modern management".