The Entity Relationship Model — Toward a Unified View of Data

A relational model of data for large shared data banks

Future users of large data banks must be protected from having to know how the data is organized in the machine (the internal representation). A prompting service which supplies such information is not a satisfactory so…

The entity-relationship model—toward a unified view of data

A data model, called the entity-relationship model, is proposed. This model incorporates some of the important semantic information about the real world. A special diagrammatic technique is introduced as a tool for data…

Research electronic data capture (REDCap)—A metadata-driven methodology and workflow process for providing translational research informatics support