This diagram provides a high-level view of the system. The activities are the various operations of the system. It similar to a flowchart that represents the flow from one activity to another activity. What is Activity Diagram?Īn activity diagram is another behavioral diagram. Overall, the use case diagram helps to model the context of the system. Therefore, those use cases and print receipt use case has the dependency “extends”. After checking balance, deposit money or withdraw money, the customer can print a receipt. To withdraw money, the system should first verify the balance. When a use case requires the support of another use case, those two use cases have the dependency “include”. There are two dependencies called include and extends. Furthermore, use case diagrams can also represent dependencies. The bank is a secondary actor, and it performs the use case filling the ATM with cash. Lines represent the association between customer and the use cases. He performs use cases such as check balance, deposit cash and withdraws money. The user case diagram for an ATM is as follows. Moreover, a rectangle represents the system boundary. ![]() It can be a person, another system or an organization who has the goal to use the system. An ellipse represents a use case, and the name is written inside of it. Use case diagram is a behavioral diagram.Ī single use case represents the high-level functionality of a system. Structured modelling describes the static features of the system while the behavior modelling describes the dynamic nature of the system. They are structured modeling and behavior modeling. Side by Side Comparison – Use Case Diagram vs Activity Diagram in Tabular Form Two of them are use case diagram and activity diagram. These diagrams help conceptual modelling and make it simple and easier to understand the system. UML diagrams help to represent Object Oriented concepts. Object Orientation is the most common methodology to develop software solutions. It helps to build a pictorial representation of the software system. It is different from other programming languages such as C, C++, Java. UML stands for Unified Modelling Language. All rights reserved.The key difference between use case diagram and activity diagram is that the use case diagram helps to model the system and user interactions while the activity diagram helps to model the workflow of the system. This kind of modeling takes place before the classic UML modeling of an application, and permits the identification of the important processes of the enterprise and the domains of responsibility of each organizational unit within the enterprise.įor more information about business process modeling with PowerDesigner, see the Business Process Model User's Guide.Ĭopyright (C) 2005. Analyzing a business processīeyond object-oriented modeling, activity diagrams are increasingly used to model the business processes of an enterprise. Each activity corresponds to an action step and the extension points can be represented as conditional branches. Analyzing a use caseĪn activity diagram is frequently used to graphically describe a use case. Each of those diagrams is independent and defines an isolated context in which the integrity of elements can be checked. You can create several activity diagrams in a package or a model. Here is a more complex example showing decisions and synchronizations: The transitions are triggered by the completion of the operations. The following example of activity diagram shows the flow of activities when starting a car:Īt a conceptual level, an activity diagram shows a detailed view of the model, focusing on the operations that are passed among activities. These flows represent the internal behavior of a model element (use case, package, classifier or operation) from a start point to several potential end points. The activity diagram gives a simplified representation of a process, showing control flows (called transitions) between actions performed in the system (called activities). ![]() Whereas a statechart diagram focuses on the implementation of operations in which most of the events correspond precisely to the end of the preceding activity, the activity diagram does not differentiate the states, the activities and the events. An activity diagram provides a complete specification of a behavior and not, like the interaction diagrams, a single possible scenario. It allows you to represent a functional decomposition of a system behavior. ![]() It is a simplification of the UML statechart diagram for modeling control flows in computational and organizational processes. PowerDesigner 12.0 > PowerDesigner OOM User's Guide > Building Dynamic DiagramsĪn activity diagram is a UML diagram that models the dynamic aspects of a system.
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