Activity exampleįigure 1 is an activity diagram describing the flow of activities executed in an instructional video website.įigure 1: UML activity diagram click to enlarge (Bob Reselman, CC BY-SA 4.0) Activity diagrams are perfect for describing how a system operates on a step-by-step, condition-by-condition basis. Also, an activity diagram can describe simultaneous activities, decision points, and subsequent behavior based on the decision's result. ActivityĪn activity diagram describes the flow of actions in a system or subsystem. The following sections describe the details of each type of dynamic diagram. UML specifies seven types of dynamic diagrams: A static diagram, on the other hand, describes the characteristics of a system or part of a system. A dynamic diagram describes the operations, actions, and changes that occur in a system over time. Types of dynamic diagramsĭynamic UML diagrams describe the behavior of systems. That application is a system that delivers an educational video to a user according to a selection made from a catalog of videos available for viewing. In this article, I go into the details of dynamic diagrams, and in another article, I explain static diagrams.Įach example diagram for this article represents a particular aspect of a hypothetical application called the Instructional Video Service. My introductory article answers essential questions like: What is UML? Why was UML created? Who created UML? and Why should you use UML? There are two basic types of UML diagrams: static and dynamic.
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