If the entrée is mild it will be accompanied by

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If the entrée is mild, it will be accompanied by salad. For any given “combo meal” order, represent the logic… 1.) Using a decision tree. 2.) Using a decision table.
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23 1 2 1.) Is the entrée meat or veggie? 2.) Is the veggie entrée spicy or mild? 3.) Is the meat entrée spicy or mild? Meat Serve Raita & Garlic Naan Veggie 3 Serve Salad & Garlic Naan Serve Raita & Naan Serve Salad & Naan Spicy Spicy Mild Mild Unique path to each action Carry state through decision points If not defined in the narrative, ordering of steps is flexible… Outcome is the final action – the complete plate
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24 1 2 3 4 Vegetarian Y Y N N Meat N N Y Y Spicy Y N Y N Mild N Y N Y Serve raita X X Serve salad X X Serve naan X X Serve garlic naan X X Conditions Actions Rules “Literal Translation”
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25 1 2 3 4 Vegetarian Y Y N N Spicy Y N Y N Serve raita X X Serve salad X X Serve naan X X Serve garlic naan X X Conditions Actions Rules “Better Translation”
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26 1 2 3 4 Entrée type (v eg/m eat) V V M M Intensity (s picy/m ild) S M S M Serve raita X X Serve salad X X Serve naan X X Serve garlic naan X X Conditions Actions Rules “Best Translation”
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Class Exercise Niki’s decides to make garlic naan a specialty menu item at extra cost, so all orders now come with regular naan. Reduce the decision table to reflect this. What conditions are no longer relevant? What actions?
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28 1 2 3 4 Entrée type (v eg/m eat) V V M M Intensity (s picy/m ild) S M S M Serve raita X X Serve salad X X Serve naan X X X X Serve garlic naan X X Conditions Actions Rules
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29 1 2 3 4 Entrée type (v eg/m eat) V V M M Intensity (s picy/m ild) S M S M Serve raita X X Serve salad X X Serve naan X X X X Conditions Actions Rules
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30 1 2 Intensity (s picy/m ild) S M Serve raita X Serve salad X Conditions Actions Rules
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Class Exercise Identify a central decision point in the DFDs for your project. What are the allowable actions? Under what conditions? Begin to model this logic using an appropriate combination of diagramming techniques. SKIP
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Requirements Gathering What does it do? Process-oriented approach Focus on software development What information does it use? Data-oriented approach Focus on DB design How does this happen? Why? In what order? Process Modeling (e.g. DFD) Data Modeling (e.g. ERD) Logic Modeling (e.g. decision table)
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Entity-Relationship Diagrams An entity-relationship diagram (ERD) is a picture showing the information that is created, stored, and used by a business system Entities lists similar kinds of information Lines drawn between entities represent relationships among the data Special symbols communicate high-level business rules Recall 620!
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35
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Entities The entity is the basic building block for a data model. It is a person, place, event, or thing about which data is collected. Entities represent something for which there exist multiple instances or occurrences .
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37
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Attributes An attribute is some type of information that is captured about an entity.
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  • Fall '08
  • Koru,G
  • Entity-relationship model

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