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Chapter 2 : Data Flow Diagram Structuring System Requirements Logic modeling

Chapter 2 : Data Flow Diagram Structuring System Requirements Logic modeling. Use Structured English as a tool for representing steps in logical processes in data flow diagrams Use decision tables and decision trees to represent the logic of choice in conditional statements

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Chapter 2 : Data Flow Diagram Structuring System Requirements Logic modeling

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  1. Chapter 2 : Data Flow Diagram Structuring System RequirementsLogic modeling

  2. Use Structured English as a tool for representing steps in logical processes in data flow diagrams • Use decision tables and decision trees to represent the logic of choice in conditional statements • Select among Structured English, decision tables, and decision trees for representing processing logic. By the end of this chapter, you will..

  3. Data flow diagrams do not show the logic inside the processes. • Logic modeling involves representing internal structure and functionality of processes depicted on a DFD • Logic modeling can also be used to show when processes on a DFD occur. Logic modeling

  4. Deliverables and Outcomes: • Structured English (Pseudocode) • Decision Tables • Decision Trees • State-transition diagrams • Object Sequence diagrams • Activity diagrams Logic Modeling

  5. Modified form of English used to specify the logic of information processes like Pseudocode. • Uses a subset of English: • Action verbs • Noun phrases • No adjectives or adverbs • No specific standards. • Similar to programming language • If conditions • Case statements Modeling Logic with Structured English

  6. Structured English is used here to describe input and output. Modeling Logic with Structured English

  7. Structured English is used here to describe arithmetic operations. Modeling Logic with Structured English

  8. Structured English is used here to describe repetition. Modeling Logic with Structured English

  9. Structured English is used here to describe decisions. Modeling Logic with Structured English

  10. Structured English is used here to describe invoking other processes. Modeling Logic with Structured English

  11. Modeling Logic with Decision Table

  12. Modeling Logic with Decision Tree

  13. Deciding Among Structured English, Decision Tables, and Decision Trees

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