class_12 - Software Engineering 3156 15-Oct-01 #12: Design...

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Software Engineering 3156 15-Oct-01 #12: Design Phil Gross
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2 Administrivia Due date for Design? Tue or Thurs? Two extra days for design, or implementation? ACM talk on C++ for Java Programmers Thursday 6-8pm Location TBD
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3 Requirements Tweaking Posted to webboard Some things had accidently been dropped Attacked is back, so is SendMap Deltas start immediately, Go is when you’re ready to play
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4 A Note on Iterations It would be better if we had a few A living demonstration on why straight-through plans are bad
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5 A Note on Good Design Adjustments are easy Result of good design Or using a well-designed frameworks Frameworks are just about the hardest thing to architect
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6 A Note on Optimization Knuth’s laws of Optimization First Law: Don’t! Second Law (for experts only): Not Yet! Try to get the thing working before you do any optimization
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7 Case Study: Denver Airport Approved in 1989, with intended opening in 1993 Mind-bogglingly huge: 53 square miles Budgeted for $2.5 billion Fully automated baggage handling system
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8 Denver Airport Baggage System budgeted at $193 million Approx 20 miles of track Barcoded luggage scanned by lasers 4000 telecars carry it to destination Tracked by photocells Run by 300 computers
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9 Timeline: Mayor’s Humiliation March 2, 1993 Denver Mayor Wellington Webb announces the first airport opening delay. The October 31, 1993 opening date is changed to December 19, 1993 to allow for a seven week debugging of hundreds of systems. October 25, 1993
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class_12 - Software Engineering 3156 15-Oct-01 #12: Design...

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