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Today’s topics

Today’s topics. Industry Practice Software Engineering Upcoming The Killer Robot Reading Great Ideas , Chapters 7. Engineering a Program. Programming in the Large Not the toy programs we are writing and demonstrating

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Today’s topics

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  1. Today’s topics Industry Practice Software Engineering Upcoming The Killer Robot Reading Great Ideas, Chapters 7

  2. Engineering a Program • Programming in the Large • Not the toy programs we are writing and demonstrating • What do we require of Software Products for Commercial or Industrial Use? • Robustness • Testing • Documentation • Customer Support • User Friendliness • Help Desk / 800 Number • Training • Follow on Products • Dealing with Competing Products • “Creeping Featurism”

  3. What Makes a Successful Product? • Class Experiences • Good • … • … • Bad • … • … • Scenario: “Bad” Product looks “Good” • Scenario: “Good” Product looks “Bad” • Which is really the good product? • Which will succeed?

  4. Program Life Cycle • Define the Product • Developing the Program Specifications • Designing the System Structure • Coding the System (small part!) • Testing the Code • Revision • Documentation • Delivery and Training • Maintenance and Upgrade

  5. Program Life Cycle Understanding Problem / Specification • Communicating with the Customer • Often customer doesn’t understand • Capabilities of computer systems • Limitations of computer systems • Possible role of user documentation • Specification languages • Can be very technical and involved • In some cases more trouble than they are worth

  6. Program Life Cycle Design Strategies/Models • Classical Waterfall Model • Everything moves forward at steady pace • Little customer involvement in design • Revision possible • Late in the game • At great expense • http://myprojects.kostigoff.net/methodology/development_models/pages/waterfall.htm • Rapid Prototyping Model • Build Prototype quickly • Get customer involved • Then: • May scrap prototype and start over • If prototype good enough, may build on it

  7. Program Life Cycle Implementation Strategies • Top Down Implementation • Stubs • Can test many parts in the absence of other parts • Output First • Allows you to “see” what the program is doing • Test as you go • Make it Run • Make it Right • Make it Fast • Always have a “running” program

  8. Program Life Cycle • Debugging (dealing with Defects) • Testing • Can only show presence, not absence of bugs • Design for Testability • Modular • Hierarchical • Correctness • Proofs • Formal Definition of Specs • Formal definition language • Very hard • Used in life-critical applications • What is a correct Graphical User Interface (GUI)?

  9. Program Life Cycle • Documentation • On-line documentation • Comments on comments in code • Program header • Block header • Function (method) specifications • Pre-conditions • Post-conditions • Variable descriptions • Java Docs • Available for Java API (see class web page) • Can produce for your own code as well

  10. Program Life Cycle • Net Productivity: 15 LINES OF CODE / DAY • Rather: 15 LINES OF CODE / DAY

  11. Aspects of Software Engineering • Psychology of Programming has its effects • Design by Committee (good or bad?) • Communications problems • Interaction • Creator Independence • 2nd System Syndrome • Organizational Schemes • Chief Programmer Team (Harlan Mills) • NY Time Morgue Project (1969) • Surgical Team Model • Assume that some people are 100 time better than others when programming

  12. Aspects of Software Engineering • Nitty-Gritty Practical Problems • Back-ups • Revision Control System • Backwards Compatibility • Staff Turnover • Pleasant Environment • Silicon Valley • . . . • Programming Tools (CASE) • E.g., IDE’s such as Eclipse • . . .

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