![]() This kind of modeling takes place before the classic UML modeling of an application, and permits the identification of the important processes of the enterprise and the domains of responsibility of each organizational unit within the enterprise.įor more information about business process modeling with PowerDesigner, see the Business Process Model User's Guide.Ĭopyright (C) 2005. Analyzing a business processīeyond object-oriented modeling, activity diagrams are increasingly used to model the business processes of an enterprise. Each activity corresponds to an action step and the extension points can be represented as conditional branches. Analyzing a use caseĪn activity diagram is frequently used to graphically describe a use case. Each of those diagrams is independent and defines an isolated context in which the integrity of elements can be checked. You can create several activity diagrams in a package or a model. Here is a more complex example showing decisions and synchronizations: The transitions are triggered by the completion of the operations. The following example of activity diagram shows the flow of activities when starting a car:Īt a conceptual level, an activity diagram shows a detailed view of the model, focusing on the operations that are passed among activities. These flows represent the internal behavior of a model element (use case, package, classifier or operation) from a start point to several potential end points. The activity diagram gives a simplified representation of a process, showing control flows (called transitions) between actions performed in the system (called activities). ![]() Two players will be associated but sequentially as the steps taken by each player are not in parallel but in sequence in an instance of a chess game. Whereas a statechart diagram focuses on the implementation of operations in which most of the events correspond precisely to the end of the preceding activity, the activity diagram does not differentiate the states, the activities and the events. Consider a use case diagram of a chess game. An activity diagram provides a complete specification of a behavior and not, like the interaction diagrams, a single possible scenario. It allows you to represent a functional decomposition of a system behavior. It is a simplification of the UML statechart diagram for modeling control flows in computational and organizational processes. We currently teach an object-oriented systems analysis and design class that uses the Dennis, et al, (2012) textbook. During the requirements phase, you can create activity diagrams to illustrate the flow of events that the use cases describe. PowerDesigner 12.0 > PowerDesigner OOM User's Guide > Building Dynamic DiagramsĪn activity diagram is a UML diagram that models the dynamic aspects of a system.
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