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A good Unified Modeling Language (UML) Class or Entity-Relationship (ER) diagram mirrors the business information needs and has the ability to store all of the necessary data requirements in a non-redundant manner.The choice between UML class diagrams and Entity-Relationship (ER) diagrams is usually an organizational decision. ER diagrams have been in existence since the early 1970s and are designed specifically to map seamlessly into relational database models. UML class diagrams were developed in the 1980s to support the object-oriented approach to system design. Initially, several different notations were proposed for class diagrams. In the mid-1990s, the Unified Modeling Language (UML) notation for design was proposed, documented, and later accepted as the defacto standard for object-oriented design.Due to the proliferation of object-oriented languages such as Java and C#, object-oriented system design with UML has become one of the most accepted design methodologies in industry. Although object-oriented DBMS’s are available and used for many applications, relational DBMS’s and hybrid OO-Relational DBMS’s are still used in the majority of information systems in use today. As a result of all of these factors, UML class diagrams are often used in place of ER diagrams to develop a logical design for relational databases.For this Discussion, you will focus on the logical database design using a UML class diagram.To prepare for this Discussion:Review the “Sample UML Class Diagram” document in the Learning Resources.Review any of the optional class diagram and modeling articles included in the Learning Resources as necessary.Analyze the “Information System Project Case Study” document in the Learning Resources and identify tables (classes) and fields (attributes) required to support the business.Review the existing processes, interviews, and your group’s use case diagram to ensure that your analysis is consistent with that information.Post to the Groups area:A list and short description of the classes and attributes you selected to store the system information. A simple list is acceptable at this point. You do not need to diagram the classes and attributes.A discussion of any questions you may have regarding the inclusion or exclusion of specific classes or attributes.
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