The History of Entity Relationship Diagrams They help us to visualize how data is connected in a general way, and are particularly useful for constructing a relational database. ERD diagrams are commonly used in conjunction with a data flow diagram to display the contents of a data store. When documenting a system or process, looking at the system in multiple ways increases the understanding of that system. Document an existing database structure. ERDs can also be used to design and model new databases and make sure that engineers can identify any logic or design flaws before they're implemented in production. An ER diagram can help businesses document existing databases and thereby troubleshoot logic or deployment problems or spot inefficiencies and help improve processes when a business wants to undertake business process re-engineering.
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