Nuggets from The Mythical Man-Month Fred Brooks University of North Carolina at Chapel Hill brooks@cs. unc. edu 1 FPB 11/24/13
How the Book Came to Be • Tom Watson, Jr. ’s Question: “Why is managing software harder than managing hardware development? ” • Comp 145 Lectures • The Anniversary Edition • Chapter 18—a precis • Chapter 19—a retrospective 2 FPB 11/24/13
1. The Tar Pit • A program, a programming system, a programming product, a programming system product • Joys of the craft • Woes of the craft 3 FPB 11/24/13
2. Brooks’s Law, and Why • Adding people to a late software project makes it later. • Obviously an over-simplification • Why this is true • Refactoring • Training • Intercommunication 4 FPB 11/24/13
4 -6. Architect—Why and How • Conceptual integrity • Achieving it, from the user’s viewpoint • Architecture, implementation, realization • Objections: • Specs will be too rich • Architect gets all the fun • Implementer stands and waits 5 FPB 11/24/13
16. No Silver Bullet • Why does hardware advance so fast and software engineering so slowly? • There is not, and cannot be, a silver bullet • Essence and “accident” (=incidental) • Complexity, conformability, changeability, invisibility • We’ve solved most of the accidents 6 FPB 11/24/13
Promising Attacks • False hopes • Buy, don’t build • Grow, don’t build—incremental dev. • The Waterfall Model has got to go! • Object-oriented, aspect programming • “The Bazaar versus the Cathedral” • Extreme programming? 7 FPB 11/24/13
What Went Wrong in Obama. Care Software? Everything! • Too little time in schedule from start • No prime contractor in charge • Ever-changing requirements • System integration by totally inexperienced government agency • No end-to-end test for working • No test for security • Political decision to roll-out unready • Just like the Challenger disaster! • Lying 8 FPB 11/24/13
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