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The two most common data models is: - Entity-Relationship Diagram (ERD) - Class Diagram
The BABOK Guide (Chapter 10: Techniques - Data Modeling) identifies the entity-relationship diagram (ERD) and the data flow diagram (DFD) as the two most common data models used in business analysis. Entity-relationship diagram (ERD): Focuses on the relationships between entities (data objects) in a system. Data flow diagram (DFD): Illustrates how data moves through a system, including processes, data stores, and external entities. These two models are widely used to represent and analyze data requirements and system behavior.
Class Model