Business Analyst: What is a data flow diagram (DFD) vs ERD?

DFD — data movement. ERD — data structure.

DFD:

• Shows data flow.
• Processes and stores.
• Movement of data.
• Dynamic view.

ERD:

• Shows data structure.
• Entities and relationships.
• Data organization.
• Static view.

Example:

When to use:

• DFD — process analysis.
• ERD — data modeling.