This Hospital Management System ER Diagram is related to data structure diagrams (DSDs), which focus on the relationships of elements within entities rather than relationships between entities. Data flow diagrams (DFDs), which depict the flow of information for processes or systems, are frequently used in conjunction with ER diagrams. In the 1970s, Peter Chen (also known as Peter Pin-Shan Chen), a Carnegie-Mellon University in Pittsburgh, is credited with developing ER modeling for database design. He published a seminal paper titled "The Entity-Relationship Model: Toward a Unified View of Data" in 1976 while working as an assistant professor at MIT's Sloan School of Management.
