A sequence diagram shows different processes or objects that live simultaneously (shown in parallel vertical lifelines), and the messages exchanged between them in the order in which they occur (shown as horizontal arrows).

It describes the interaction between objects in the sequential order that these interactions occur. Use cases are often refined into one or more sequence diagrams.Įlements of a use case diagram Sequence diagramĪ sequence diagram is an interaction diagram.

Package diagrams are useful when class diagrams that encompass the whole system become too large.Įlements of a package diagram Use case diagramĪ use case diagram is a dynamic behavior diagram that describes a set of actions (use cases) that some system or systems should or can perform in collaboration with one or more external users of the system (actors). A package diagram is just a class diagram that shows only packages and dependencies. It shows the packages of classes that make up the model, and the dependencies between the packages. It describes the static structure of a system by imaging the classes of the system, their attributes, operations (or methods) and the relationships between the classes.Įlements of a class diagram Package diagramĪ package diagram is a static structure diagram.

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