1. Chapter 9 Structuring System Requirements: Logic Modeling
Modern Systems Analysis and Design Third Edition Jeffrey A. Hoffer Joey F. George Joseph S. Valacich
Chapter 9
Structuring System Requirements:
Logic Modeling
9.1
Copyright 2002 Prentice-Hall, Inc.

2. Learning Objectives
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
Logic modeling and Internet applications
9.2

3. Logic Modeling
Data flow diagrams do not show the logic inside the processes
9.3

4. Logic Modeling
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

5. Logic Modeling Deliverables and Outcomes Structured English
Decision Tables
Decision Trees
State-transition diagrams
Sequence diagrams
Activity diagrams
9.5

6. Logic Modeling In our Course we discuss the main three technique
Structured English( Pseudocode)
Decision Tables
Decision Trees
9.6

7. Modeling Logic with Structured English
Modified form of English used to specify the logic of information processes or like Pseudocode
Uses a subset of English
Action verbs
Noun phrases
No adjectives or adverbs
No specific standards
9.7

8. Modeling Logic with Structured English
Similar to programming language
If conditions
Case statements
Figure 9-3 shows Structured English representation for Hoosier Burger
9.8

9. Modeling Logic with Structured English

10. Summary Several methods of logic modeling Structured English
Primarily communication technique for analysts and users
9.10