Jul 25, 2019 · It's almost correct. You should write the text in curly brackets. That will identify it to be a constraint. Further you should use the correct case for Default User. Eventually you can link the constraint to the actor as well. And yes, you can go on like that. Maybe, Rate Post is another use case. Think about that.

A constraint is one of three UML’s extensibility mechanisms: Steretypes, Tagged Values and Constraints. A constraint extends the semantics of a UML building block, allowing you to add new rules or modify existing ones.

Certain kinds of constraints (such as association "or" constraint) are predefined in UML; others can be user defined. A constraint represents semantic information attached to a model element, not just a view of it. A binary constraint allows a constraint to be …

To create a Use Case Diagram: Select first an element where a new Use Case Diagram to be contained as a child. Select Model | Add Diagram | Use Case Diagram in Menu Bar or select Add Diagram | Use Case Diagram in Context Menu. See also. UML Use Case Diagram - For more information about UML Use Case Diagram. To create an Use Case Subject:

Jan 2, 2018 · A use case shows a single added value the system under consideration delivers to one of its actors. Login is no use case since it has no added value. It is a constraint which you can attach to use cases.

Dec 2, 2022 · A UML (Unified Modeling Language) use case diagram is a visual representation of the interactions between actors (users or external systems) and a system under consideration. It depicts the functionality or behavior of a system from the user’s perspective.

Jan 3, 2025 · A Use Case Diagram is a type of Unified Modeling Language (UML) diagram that represents the interaction between actors (users or external systems) and a system under consideration to accomplish specific goals.

Mar 28, 2025 · By following this comprehensive guide, you can create effective UML use case diagrams that accurately capture the functional requirements of your system and facilitate better communication among stakeholders.

A constraint is a condition or restriction that a use case operates under and includes pre-, post- and invariant conditions. A precondition specifies the conditions that need to be met before the use case can proceed.

Constraint in UML represents some condition, restriction or assertion related to a UML element or elements. It could be used on several types of UML diagrams, e.g. class diagrams, activities, sequence diagrams, etc. See examples of constraints in this article.