![]() UML is a notation that resulted from the unification of OMT from Hence, it provides constructs for a broad range of systems and activities (e.g., distributed systems, analysis, system design and deployment). UML has been designed for a broad range of applications. A merge node combines the edges starting from a decision node, marking the end of the conditional behavior.The goal of UML is to provide a standard notation that can be used by all object-oriented methods and to select and integrate the best elements of precursor notations. The second diamond-shaped node is called a merge. Only one edge is followed out of the decision node depending on whether the author is authorized. Notice that there are two outgoing edges from the decision in Figure above, each labeled with Boolean conditions. Edges string the actions together to determine the overall activity flow: first the initial node becomes active, then the first diamond-shaped node is called a decision, analogous to an if-else statement in code. A line going into a node is called an incoming edge, and a line exiting a node is called an outgoing edge. The arrowhead on an activity edge shows the direction of flow from one action to the next. The flow of the activity is shown using arrowed lines called edges or paths. An action could be a behavior performed, a computation, or any key step in the process. Actions are the important steps that take place in the overall activity, e.g., Select Account Type, Enter Author’s Details, and so on. In between the initial node and the activity final node are actions , which are drawn as rounded rectangles. Now let’s elaborating the use case (from requirement - what to the high level logic workflow - How) with an activity diagram : The Main Flow and Extension sections describe steps in the blog account creation process. ![]() The following Table contains the Create a new Blog Account use case description. Let’s look at the basic elements of activity diagrams by modeling the steps in the blog account creation use case. This allows you to define and execute, for example, a payment approval process where one of the steps invokes a credit card approval web service using an easy graphical notation such as activity diagrams.įor example, you can use an activity diagram to model the steps involved with creating a blog account. Some business process management (BPM) tools allow you to define business processes using activity diagrams, or a similar graphical notation (like BPMN), and then execute them. ![]() Activity diagrams are particularly good at modeling business processes.Ī business process is a set of coordinated tasks that achieve a business goal, such as shipping customers’ orders. In fact, activity diagrams have their roots in flowcharts, as well as UML state diagrams, data flow diagrams, and Petri Nets.Īctivity diagrams show high-level actions chained together to represent a process occurring in your system. Activity diagrams allow you to specify how your system will accomplish its goals.Īctivity diagrams are one of the most accessible UML diagrams since they use symbols similar to the widely-known flowchart notation therefore, they are useful for describing processes to a broad audience. Use cases show what your system should do.
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