Facts and Fallacies of Software EngineeringGlass软件开发与工程玻璃.pptVIP

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Facts and Fallacies of Software EngineeringGlass软件开发与工程玻璃.ppt

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Facts and Fallacies of Software EngineeringGlass软件开发与工程玻璃

Facts and Fallacies of Software Engineering (Rob Glass) CSE301 University of Sunderland Discussed by Harry R. Erwin, PhD Prime Citation Robert L. Glass, 2003, Facts and Fallacies of Software Engineering, Addison-Wesley. Glass is very good, he cites his sources, and they are usually peer-reviewed. What you should get from this lecture is information to help you think critically about the software development process. Management Facts People Tools and Methodologies Estimation Reuse Complexity People The most important factor in software work is the quality of the programmers. The best programmers are up to 28 times better than the worst programmers. Adding people to a late project makes it later. The working environment has a profound impact on productivity and quality. Tools and Methodologies Hype is the plague on the house of software. New tools and techniques cause an initial loss of productivity and quality. Software developers seldom really use tools. Estimation A common cause of runaway projects is poor estimation. Software estimation is usually done at the wrong time and by the wrong people. Software estimates are rarely corrected. You will live and die by software estimates, despite their badness. There is a disconnect between management and programmers. Feasibility studies almost always answer ‘yes’. Reuse Reuse in the small is well-solved. Reuse in the large is mostly unsolved. Reuse in the large works best for families of related systems. Reusable components cost three times as much to build and should be tested in at least three settings. Modification of reused code is particularly error-prone. Design pattern reuse is a good idea. Complexity For each 25% increase in problem complexity, there is a 100% increase in solution complexity. 80% of software work is intellectual. Some is creative. Little is clerical. Life Cycle Facts Requirements Design Coding Error Removal Testing Reviews and Inspections Maintenance Requirements The second common cause of runaway