Scenarios of DFDs and ERDs questions and memorandum.
Understand the Problem
The question is asking for examples of scenarios that can be modeled using Data Flow Diagrams (DFDs) and Entity-Relationship Diagrams (ERDs), as well as a memorandum or guidance on how to approach these topics.
Answer
DFD represents data movement in a system; ERD models database structure.
A Data Flow Diagram (DFD) visually represents the flow of data within a system, typically describing processes, data stores, and data movement. An Entity-Relationship Diagram (ERD) models the data and relationships within a database, focusing on entities, attributes, and their interrelations.
Answer for screen readers
A Data Flow Diagram (DFD) visually represents the flow of data within a system, typically describing processes, data stores, and data movement. An Entity-Relationship Diagram (ERD) models the data and relationships within a database, focusing on entities, attributes, and their interrelations.
More Information
DFDs and ERDs are crucial tools in systems analysis and database design, providing complementary views that help in understanding and designing information systems efficiently.
Tips
Common confusion arises when mixing up the data flow (DFDs) with structural data representation (ERDs). Understand the focus: data movement vs. data structure.
Sources
- DFD-Exercises -Memo - Studocu - studocu.com
- E-R Model Case Studies 1 - JIS College of Engineering - jiscollege.ac.in
- System analysis (docx) - CliffsNotes - cliffsnotes.com
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