This Chen ERD Animal Clinic is Chen's notation entity-relationship diagram. This faculty information Chen ERD is completely free to download and customize. You can also open this Chen ERD symbol set when you open this template. You can quickly create a nice Chen ERD by dragging and dropping shapes. Entity-relationship diagrams are a useful tool for database design. They depict the entities involved, their characteristics, and their interrelationships. You must define these elements before properly understanding the database's structure.