3156-5 - COMS W3156 Software Engineering Fall 2001...

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COMS W3156: Software Engineering, Fall 2001 Lecture #5: Tools and Networking Janak J Parekh [email protected]
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Administrativia Recitation tomorrow: most likely early afternoon Permanent time yet to be set (hopefully by classtime) Late group proposals We’ll have to return assignments tomorrow Requirements will be out tomorrow night, barring unforeseen problems Notes going out between noon and 1pm, soon 9am
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Next class We go object-oriented in a big way Read UML chapters 3-5, Schach chapter 12 Object-oriented specification using UML technologies: what you will be doing for the next milestone We’re skipping around to prepare for milestones Might want to consider reading chapters 1-2 of UML: pretty short, useful intro
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Today’s class Finish up chapter 5: analytical tools Networking basics
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Stepwise refinement (I) Based on the principle of functional abstraction Worry about the high-level details first, smaller problems can be dealt with later Useful for specification, design and implementation In implementation, though, you sometimes need the smaller pieces first
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Stepwise refinement (II) Purchase order system Add purchase orders Edit/delete purchase orders Print purchase orders Fulfill purchase orders Now, drill down one level
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Stepwise refinement (III) Add purchase orders Get input from user Validate input Compute totals on PO Add to database Edit/delete: similar to previous Print purchase orders Request which to print from user Format for printout Print
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Stepwise refinement (IV) Fulfill purchase orders Identify purchase order to fulfill Have user enter quantity shipped Determine if purchase order is completely fulfilled Now, one drills down, and down, and down I don’t particularly like Schach’s example, but the process is valid
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Cost-benefit analysis
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