Guard conditions, which indicate a condition required for the workflow to proceed, and which normally (but not always) follows a decision. allow you to show alternative threads in the workflow of a business use case." Useful for presenting workflows that have one or more possible outcomes, "decisions. These are represented by ovals.ĭecisions, which indicate a choice between multiple conditions. This is represented by an arrow.Īctivities, which indicate steps or stages in the workflow. This is represented by a blackened circle.Ĭontrol flows, which indicate the direction of the workflow. Initial nodes, which indicate the start of the workflow (also known as initial state).
The more commonly used elements of an activity diagram are: As the Sourcemaking website notes, "Activity diagrams allow you to think functionally." Not only do they enable analysts to think about a workflow functionally, they enable the practical presentation of a workflow. They also help analysts to think through the process of the workflow by their very creation. A basic example of an activity diagram is below:Īmong the most common workflow diagrams employed by the business analysis profession, activity diagrams are useful for describing "the interaction between the players and the business as the use case is played out." Because they do enable the display of both players and the business processes, and because they employ simple diagramming techniques, activity diagrams are easy for even junior analysts to pick up quickly.
They also enable the simple presentation of multiple conditions and choices within a workflow. An activity diagram shows the overall flow of control." Another site puts it even more simply: "Activity diagrams are used to illustrate activities." To that end, activity diagrams may be used to describe an entire system, a use case, or an activity within the use case. As one site notes, "In the Unified Modeling Language, activity diagrams can be used to describe the business and operational step-by-step workflows of components in a system. Its purpose is to enable analysts to present a concrete, easy-to-follow visual of the workflow of a business use case. An activity diagram is a type of flowchart that is part of the UML (Unified Modeling Language) standard.
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