The Mythical Man-Month: Essays on Software Engineering is a book on software engineering and project management by Fred Brooks, whose central theme is that "adding manpower to a late software project makes it later". This idea is known as Brooks' law, and is presented along with the and advocacy of prototyping. The work was first published in 1975 (ISBN 0-201-00650-2), reprinted with corrections in 1982, and republished in an anniversary edition with four extra chapters in 1995 (ISBN 0-201-83595-9), including a reprint of the essay "No Silver Bullet" with commentary by the author.