URCOVERED SYSTEM DESIGN4 According to Tilley and Rosenblatt, an entity-relationship diagram (ERD) is a model that shows the logical relationships and interaction among system entities (pg. 287). The following Entity Relationship Diagram (ERD) shows the proposed solution for URCovered, Inc. It indicates how the customer interacts with the mobile application, the case manager, and the claims database. The client would, using the mobile application, open a new claim and then could make queries against that claim for information. In turn, the claims manager would create the requested claim and then be able to post updates to that claim via the mobile application.