![]() The fastest and easiest way to draw an activity diagram is with an online diagramming tool like Gliffy. It’s a circle outlined with another circle that indicates that the activity has reached its final step. The end symbol is the last part of the activity diagram. These can provide helpful context or even link to other pages or diagrams that have more information. Notes can be added to the diagram to add clarity or specification that doesn’t fit within the structure and shapes of the activity diagram. These are represented by a solid bar that’s thicker than the rest of the lines in the diagram. Synchronization bars, which may also be called joint symbols, represent either two concurrent activities joining a single linear flow or a single flow branching out into concurrent activities. The outputs typically include conditional text describing the conditions in which the activity takes that direction. Decision SymbolĪ decision symbol, represented by a diamond shape, is a branch in the flow of activity that requires one input and at least two outputs. These arrows show the direction of the activity. Connector SymbolĬonnector symbols are also called control flows, and are also essential to creating an activity diagram. Activity SymbolĪctivity symbols are the most important part of the activity diagram - they represent the activities that make up the process. The start symbol is a filled black circle that indicates the beginning of the activity and is an essential element of an activity diagram. What symbols will you need to use when you create your activity diagram? Here are the most important ones to know. During planning it helps to visualize the workflows and demonstrate the logic of the algorithm and during requirements gathering can be used for representing the different use cases of a system.Īlthough activity diagrams are similar to flowcharts, they have more detailed notation and elements that make them a better fit for technical projects. ![]() ![]() They are useful throughout different stages of developing a system. Like many other UML diagrams, they simplify complex systems and are a valuable addition to documentation. What Are the Benefits of Activity Diagrams?Īctivity diagrams are the best method of communication for system flows and technical processes. They are used to model software systems during the planning and implementation process or business requirements as part of business process modeling. These types all show the behavior of a modeled system.Īctivity diagrams also have similarities in function with data flow diagrams. They are further categorized as a type of behavior diagram, along with use case diagrams and state machine diagrams. They’re one of the most popular types of UML diagrams because of their similarities with a simple flowchart. In the case you describe, an application that "is state based and the user's experience does not follow a pre-defined route", I would stick to state machine diagrams and not create any activity diagrams.An activity diagram is a visual description of the flow of one activity to another as part of a larger system or process. I don't know your definition of a storyboard, but in my perception, an activity diagram can be used to make one (but this diagram type can also be used for other purposes). For an example, see "Which UML models should we make?", page 10. The actions in the activity diagram more or less correspond to the steps of the use case (depending on how much UI-specific information you have in the use cases). If you want to model the user experience, with a focus on use cases, i.e., if you want to model how the user navigates through the application to accomplish a certain task, I would recommend to use a UML " activity diagram" for each use case. There are several ways of drawing navigation maps and a state machine diagram is just one way (but this diagram type can also be used for other purposes). See and my own paper "Which UML models should we make?" (section "Navigation Map", page 12). Each state represents a screen or a popup and each transition represent a user action. If you want to model the user experience, with a focus on providing an overview of the screens (or web pages), I would recommend to use a UML " state machine diagram", maybe more than one. If I understand you correctly, you are looking for ways to model the user experience in the form of diagrams.
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