Process modeling shows data flows through the system
as determined by organizational rules, decisions, and
A Data Flow Diagram is a Process Model consisting of
Data Flows, Data Stores, and Data Transformations.
A Decomposition Diagram (also called Hierarchy Charts) is a Process Model that breaks a system into
processes and subprocesses showing increasing
detail. They show top-down functional decomposition of
the system's structure.
- Function - A set of related & ongoing activities
Event - A logical work unit which must be completed
in its entirety - events are also called "Transactions."
- Process Customer Order - is an Event.
Elementary Process - detailed & discrete that complete
the response to an Event.
- "Validate Customer Identification" is an Elementary
Other Elementary Processes
- Perform Calculations
- Make Decisions
- Summarize Data
- Organize Data
- Trigger other Processes
- Use Stored
Procedures of Representing Elementary Processes
Use Structured English
- Simple Declarative Sentences (Get, Find, Record,....),
Conditional Decision Structures (If, Then, Else,...),
Iteration (Do until...). We are dealing here with
- Structured English - Reflects Organizational Policy,
deals with data flows, data attributes, etc.
- * Use Decision Tables