![]() The essential behavior of systems can often be expressed with a state model. This diagram leveling process continues until primitive processes yield a short textual description. The system process explodes to a child diagram where its split into smaller processes connected by flows and stores to illustrate data flow and transformation.įlows in and out of the system process must balance with flows in and out of its child diagram. The most popular notations are Yourdon/DeMarco for technical software and Gane & Sarson for business systems. ![]() The system is represented as a named process with data flows in and out to the external world. Process models, also called data flow diagrams (DFDs) start with a top level context diagram for a system. ![]() Martin's Information Engineering notation is typically used for data models. A database can be designed using logical and physical data models that highlight primary and foreign keys. The Unified Modeling Language (UML) is the industry standard notation for class diagrams.Īn entity-relation diagram, called an ERD illustrates the data structure of an information system. These diagrams show the static structure of object classes and important relationships between them. Software Models - Examples and Description of MacA&D and WinA&D DiagramsĬlass diagrams are fundamental to object-oriented analysis and design.
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