What are the three major parts of an ERD diagram?

Question

BlackTom AI · Accepted Answer

To analyze the question, I’ll evaluate what typically constitutes an ERD diagram and what the listed options imply.
Option 1: 'Relationship, data flow, entity' includes 'data flow,' which is characteristic of data flow diagrams (DFDs), not ERDs. ERDs focus on how data is structured, not on the flow of processes, so this is not correct.
Option 2: 'Attribute, modularity, cardinality' mentions 'attributes' (a valid component) but 'modularity' and 'cardinality' are not primary structural parts of an ERD. Cardinality is a property of relationships, while modularity is not a standard ERD component, making this option invalid as a trio of major parts.
Option 3: 'Relationship, attribute, entity' lists the classic three core elements of an ERD. An entity represents a real-world object, attributes describe its properties, and relationships show how entities associate with one another. This aligns exactly with standard ERD theory.
Option 4: 'Process, data flow, data store' resembles terminology from data flow diagrams, where processes transform data and data stores hold it. This is not the language used for the core components of an ERD, so it’s incorrect in this context.
Option 5: 'Process, entity, and relationship' mixes ERD terminology with 'process,' which is not part of ERD vocabulary. 'Process' is more typical of DFDs; ERDs do not center on processes as such, so this option is misleading and incorrect.
Overall, the reasoning shows that the only option aligning with the foundational elements of an ERD is option 3, while the others mix in concepts from other diagram types or use nonstandard terminology, which leads to incorrect classifications.

45582/46551: IST/BSAN 325 Systems Analysis and Design LEC Chapter 5 Review

What are the three major parts of an ERD diagram?

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