5 Questions
What is the focus of a logical data flow diagram?
How the business operates
What does a physical data flow diagram show?
How the system will be implemented
What is the ideal progression for developing systems using data flow diagrams?
Analyze current system, add features, develop implementation methods
When should a logical DFD be constructed?
Before constructing a physical DFD
What are the advantages of using a logical model?
Better communication with users
Study Notes
Data Flow Diagrams (DFDs)
- The focus of a logical data flow diagram is on the system's functional requirements, illustrating the flow of data through the system without considering the physical implementation.
Physical Data Flow Diagram
- A physical data flow diagram shows the actual implementation of the system, including the physical components, flow of data, and the storage of data.
Developing Systems using DFDs
- The ideal progression for developing systems using data flow diagrams is to first create a logical DFD, followed by a physical DFD.
Constructing a Logical DFD
- A logical DFD should be constructed during the analysis phase, before the design phase, to identify the system's functional requirements and boundaries.
Advantages of Logical Modeling
- The advantages of using a logical model include the ability to identify functional requirements, identify system boundaries, and provide a clear understanding of the system's data flow without worrying about the physical implementation.
Test your understanding of logical and physical data flow diagrams with this quiz. Explore the concepts of business operations and system construction while delving into the depiction of business events and data within the context of data flow diagrams.
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