It can also show external systems (as actors, typically places to the right of the use cases) that are … 3. Both Sequence Diagram and Activity Diagram are UML diagrams. 1. What is the Difference Between Object Code and... What is the Difference Between Source Program and... What is the Difference Between Fuzzy Logic and... What is the Difference Between Syntax Analysis and... What is the Difference Between Mint and Peppermint, What is the Difference Between Cafe and Bistro, What is the Difference Between Middle Ages and Renaissance, What is the Difference Between Cape and Cloak, What is the Difference Between Cape and Peninsula, What is the Difference Between Santoku and Chef Knife. Actors may interact either directly or indirectly with the system. You can pick up any number of books on use cases which will explain the difference between a use case and a data flow process (Analysis Through Pictures, by Leslie Munday for example). A simple answer is that a use case diagram does not describe data or events, it describes needs and relationships. They are almost self explanatory; they show the calls between the different objects in their sequence and can show, at a detailed level, different calls to different objects. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. However Sequence Diagram represents sequence of activity in between different modules. A System sequence diagram visualizes a use case, while a sequence diagram visualizes a method of a class. Dynamic view of the system is represented using diagrams such as sequence diagrams, activity diagrams, etc. Java Singleton Design Pattern Practices with Examples, Difference Between Flood-fill and Boundary-fill Algorithm, Difference Between Architectural Style, Architectural Patterns and Design Patterns, The Decorator Pattern | Set 2 (Introduction and Design). Activity diagram is also called as object-oriented flowcharts. 5. “Activity Diagram.” 1. An activity diagram is particularly good at expressing the flow of objects—matter, energy, or data—through a behavior, with a focus on how the objects can be accessed and modified in the execution of that behavior during system operation. Writing code in comment? Sequence diagrams show a detailed flow for a specific use case or even just part of a specific use case. Use case diagrams are a set of use cases, actors, and their relationships. Reference: 1. The horizontal rectangle with the underlined text denotes the objects. Show activity on this post. Example: A sequence diagram for an emotion based music player: An Activity Diagram is basically a flowchart (Unified Modelling Language) diagram which is used to describe the dynamic aspect of the system. Sequence diagram is mainly used to represent the time order of a process. Sequence diagrams are normally associated with use cases. in a single use case. Please write to us at contribute@geeksforgeeks.org to report any issue with the above content. “UML Sequence diagram” (CC BY-SA 3.0) via Commons Wikimedia. What is an Activity Diagram      – Definition, Functionality 2. The use cases enclosed in the system boundary represent the functionalities performed by behaviors (activity diagrams, sequence diagrams, and state machine diagrams). ~Activity diagrams ~Use case diagrams ~Sequence diagrams ~Class diagrams ~State diagrams. What Is The Difference Between Class Diagram and Object Diagram? The main difference between activity diagram and sequence diagram is that the activity diagram represents the flow of activities in a system while the sequence diagram represents the sequence of messages flowing from one object to another. A use case represents a particular functionality of a system. Sequence diagram is used for the purpose of dynamic modelling. In the above sequence diagram, the arrows represent the request messages. The Sequence diagram represents the UML, which is used to visualize the sequence of calls in a system that is used to perform a specific functionality. The main difference between activity diagram and sequence diagram is that the activity diagram represents the flow of activities in a system while the sequence diagram represents the sequence of messages flowing from one object to another. Purpose The purpose of an activity diagram is to describe the procedural flow of actions as part of an activity. 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