Swimlanes – These are columns or categories that are created to group related activities that are carried out by different actors.For example, in order for payment to push through, a user may receive a signal in the form of an OTP for authorization. Signals – Used to indicate how actions can be made outside the system to modify an activity.Synchronization – Consists of the fork node which marks the creation of concurrent flows and the join node which merges back the concurrent flows into a single flow.Decisions – These are the decisions that need to be answered by ‘yes’ or ‘no’ before proceeding to another action or activity.Objects – These are the materials or data that are created or used within an activity.Following our example, an action could be a user checking their account balance. Actions – An action or step in the activity in which the system or the user performs a task.An example could be a user logging into their account in a mobile banking system. Activity or action state – Represents a single activity that sets a series of actions into motion.Initial state and final state – All activity diagrams have an initial state and final state that mark the start and end of the process.Here are the basic components of an activity diagram: However, the difference between them lies in the elements and symbols that make up an activity diagram. What are the basic components of an activity diagram?Īctivity diagrams are often compared to flowcharts because they show how a process “flows” from one activity to another. Provide a reference point for future developers or those involved in system maintenance.Allow stakeholders to visualize steps, decisions, and interactions to root out inefficiencies.Illustrate the flow of activities so that it’s easy to understand the behavior and structure of a system.Let’s explore a few ways how activity diagrams benefit users: Defining the logic or rules of a systemĬREATE THIS DIAGRAM What are the benefits of an activity diagram?Īn activity diagram can be helpful in a variety of ways.Illustrating the dynamic aspects of a system.Meanwhile, at the requirements stage, activity diagrams can be used to present different use cases for a system.Īs for the design phase, an activity diagram can model software elements such as method, function, and operation. What are activity diagrams used for?Īctivity diagrams are used for various purposes and at different stages in the development process.ĭuring the planning stage, you can create an activity diagram to depict workflows and visualize the sequence of activities in a system. UML activity diagrams fall under behavior diagrams because they model how a system behaves when actions are performed to complete an activity or process.Īlthough activities are usually laid out in sequential order, activity diagrams can also show concurrent activities or activities that are happening at the same time.Īn activity diagram can also be used to present the flow of events and identify the requirements in a business process. In UML, systems are modeled either based on their structure or behavior and are classified into structural UML diagrams or behavioral UML diagrams. UML or Unified Modeling Language is a software modeling language used in visualizing the design of a particular system. Here is an example of an activity diagram that shows the actions or steps executed upon the creation of a transaction in a payment processing system: Similar to flowcharts, activity diagrams illustrate parallel activities, decisions, and conditions and are commonly used in business process modeling to provide a clear depiction of activity flows for system analysis and design. What are the basic components of an activity diagram?Īn activity diagram visually represents the flow of actions or processes within a system.What are the benefits of an activity diagram?.START CREATING FOR FREE Click to jump ahead: Want some extra help? Check out our activity diagram templates to help make a clear and compelling activity diagram. This article will discuss what an activity diagram is, its components, and how you can create an uml activity diagram to help with your projects. Activity diagrams are great tools for modeling how a system should behave upon performing a series of actions.Īctivity diagrams are particularly used in software development and can be employed in the different phases of a project.
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