UML diagrams are graphical representations of different aspects of a system, such as classes, objects, use cases, activities, sequences, states, components, and deployments.

Activity diagrams and use case diagrams are both types of UML diagrams that can be used for requirements engineering. However, they have different purposes and levels of abstraction.

Use case diagram is a platform that can provide a common understanding for the end-users, developers and the domain experts. It is used to capture the basic functionality i.e. use cases, and the users ...

A use case is made up of a set of possible sequences of interactions between systems and users that defines the features to be implemented and the resolution of any errors that may be ...

Large and complicated UML models are not useful, because they are difficult to understand. This problem can be solved by using several diagrams of the same system at different levels of abstraction.

Large and complicated UML models are not useful, because they are difficult to understand. This problem can be solved by using several diagrams of the same system at different levels of abstraction.