What are some advantages and disadvantages of the DFD (Data Flow Diagram)? Describe the difference between a PFD (Process Flow Diagram) and DFD (Data Flow Diagram). What is the purpose of an ERD (Entity Relationship Diagram) Briefly outline the steps for the LDM (Logic Data Modeling) procedures.Pick one of the types of legacy systems, and describe a real-world example of that type.
Advantages and disadvantages of the DFD
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