![]() ![]() Difference Between Activity Diagram and Sequence Diagram DefinitionĪn activity diagram is a graphical representation of workflows of stepwise activities and actions with support for choice, iteration, and concurrency. When considering implementation and execution, it is important to discover the interactions between the components using a sequence diagram. The horizontal rectangle with the underlined text denotes the objects. The dashed arrows represent the return messages while the rectanglular vertical boxes denote the activation times of objects. In the above sequence diagram, the arrows represent the request messages. In other words, it represents the sequence of messages flowing from one object to another. What is a Sequence DiagramĪ sequence diagram is a behavior diagram that represents the interaction between objects over a specific period of time. Finally, the end symbol indicates the completion of an activity diagram. Then the join symbol combines multiple actions (activity 6, 7, 8) into one. After activity 5, there is a fork symbol. If the condition is false, another set of activities will occur. If the condition is true, a set of activities will occur. The diamond symbol represents a condition. In the above diagram, the starting point is the initial node, while the arrow represents the flow of the activities. An example activity diagram is as follows. Activities represent operations of the system. – Comparison of Key Differences Key TermsĪn activity diagram is a behavioral diagram that represents the flow of activities from one to another. What is the Difference Between Activity Diagram and Sequence Diagram Activity and sequence diagrams are two behavior diagrams. Structural diagrams represent the static aspects of the system while behavior diagrams represent the dynamic aspects of the system. Furthermore, there are two types of UML diagrams they are the structural and behavioral diagrams. Moreover, it is easier to learn, and it provides a pictorial representation of the software. It allows implementing object-oriented programming concepts to model the system. UML (Unified Modeling Language) is a standard language to visualize, construct and document software. The main difference between activity diagram and sequence diagram is that the activity diagram represents the flow of activities one after the other in a system while the sequence diagram represents the sequence of messages flowing from one object to another. ![]()
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