Process Decomposition

1
Process Decomposition

• Techniques for system modeling

2
Functional Decomposition

• Functional decomposition is used to design large
  transaction type systems in which the process
  sequence is determined by the computer
• Hierarchy Charts
• Data Flow Diagrams
• IPO analysis

3
Registration Problem

• Students register for OU classes at UCT by
  determining classes from the catalog with advice
  from program and staff advisors. Once classes
  start students attend classes and prepare
  assignments. At the end of the semester the
  professor assigns grades and reports results to
  the University.

4
Hierarchy Charts

• Hierarchy charts are used to identify the major
  functions that a system must perform, next
  identify major sub-functions, etc.
• Hierarchy charts can also include input and
  output variables.

5
Hierarchy Chart

• Register for Class
• Review Catalog
• Consult Program Advisor
• Consult UCT Advisor
• Take Course
• Attend Classes
• Prepare Assignments
• Generate Grades
• Assign Grades
• Report Results

6
Data Flow DiagramContext (Level 0)
Advice
Requests
Students
Advisors
Schedules
Registration System
Grades
Work
OU Admin
7
Data Flow DiagramLevel 1
Requests
Students
Advice
Advisors
1. Register for Class
Classes
Schedules
D1 Classes
Work
Roster
D3 Rolls
St
3. Generate Grades
Roster
2. Take Course
D2 Students
Grades
Test_Results
OU Admin
8
Entity Relationship Diagram
Classes
Students
Rolls