Systems Analysis and Design - Chapter 5
Process Model - Definition: A graphical representation of how a business system operates, illustrating the processes or
activities performed and the flow of data among them.
Data Flow Diagramming (DFD) - Definition: A technique used to visually diagram ...
- Definition: A graphical representation of how a business system operates, illustrating the processes or
activities performed and the flow of data among them.
Data Flow Diagramming (DFD)
- Definition: A technique used to visually diagram business processes and the data exchanged among
them. The emphasis is on depicting the activities performed within the system.
Logical vs. Physical Process Models
- Logical Process Models: Describe processes without specifying how they are conducted. Focus on the
what rather than the how.
- Physical Process Model: Provide detailed information necessary for system development, illustrating
how the process is implemented.
Key Terms
1. Process: An activity or function carried out for a specific purpose.
2. Data Flow: A single piece of data or a logical collection of multiple pieces of information moving
through the system.
3. Data Store: A collection of data stored in some form, such as a database.
4. External Entity: Individuals, organizations, or systems that interact with the system but are not part of
it.
5. Decomposition: The breakdown of DFDs into smaller, more detailed DFDs to enhance clarity and
understanding.
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