Requirement Analysis and Modelling question

Develop a complete ERD for the identified entities and relationships. Must show correct cardinalities as well as entity attributes.

Case Study: DigiHealth Medical Services DigiHealth Medical Devices is a local company that specialises in medical monitoring through remote, mobile telecommunication devices. One of the newly developed devices in their range of products is a portable and wearable glucose monitor embedded in a wristband which transmits results to a designated medical center in real time. Providers and patients can incur significant costs when glucose levels are not maintained within acceptable tolerances. Episodes of high or low glucose can results in expensive medical costs and possible hospitalisation. These episodes if left unchecked can then lead to more severe and expensive long-term ailments like vision, circulatory and renal problems. The device is known as the Real-Time Glucose Monitoring device (RTGM) and it is approximately the same size as the current model Apple iWatch. The data collected by the device is sent to MyHealth Medical Centres, which has partnered with DigiHealth in the development of this product. The RTGM currently works very well with Apple iPhones, but it does not integrate with all the Android phones. DigiHealth plans to develop the app further for improved integration in the Android operating system. Once the updated version is completed, MyHealth Medical Centre patients will have free use of the app across all popular smart phones and DigiHealth will resell the app to other health care providers and possibly the government. Alert data Alert data Request alert data Patient View/ respond to alert View history Physician view/ respond to alert Request alert data Alert data Alert data History data History data Alert History data Alert conditions GlucoseObservation Annotation Annotate history Annotation HistoryAnnotation Monitoring Device Set alert conditions Alert conditions MedicalPerson Message Message Patient Doctor Patient Send message to physician Cell Phone Send message to patient Message Message Message Message Message View/hear message from physician View/hear message from patient Message Message Figure 1.3: Level O DFD