Describes generally accepted project management practices. A Systems Approach to Planning, Scheduling and Controlling Fourth edition is up to 1,000 pages. Comprehensive in most respects. Oriented toward larger projects done under contract. Not enough detail once you get a project team much larger than 4-5 people.
Emphasis is on analysis and use rather than defining logic.
Better than Drucker because its approach is as applicable to managing a small team as it is to managing a large corporation. Every PM should read it at least once. Focuses on the relationship side of negotiation. Short but insightful discussion of modern quality management. A great book on management.