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Please note : This help page is not for the latest version of Enterprise Architect. The latest help can be found here.

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Communication Toolbox

The Communication Toolbox is used to develop Communication diagrams, in which you model dynamic interactions between elements at run-time. These diagrams are used to model workflow and sequential passing of messages between elements in real time; they are often placed beneath Use Case elements to further expand on Use Case behavior over time.

The Actor element models a user of the system, while the other elements model things within the system, including standard elements (Object) and the user interface component (Boundary), Controller and Entity.

Communication Toolbox pages



See also

Except where discussed here, each element and relationship that you can create using these Toolbox pages is described in the UML Elements and UML Connectors sections of the Help.

A Boundary is a stereotyped Object that models some system boundary, typically a user interface screen.

A Control is a stereotyped Object that models a controlling entity or manager.

An Entity is a stereotyped Object that models a store or persistence mechanism that captures the information or knowledge in a system.

Behavioral Diagram Elements Structural Diagram Elements UML Connectors Boundary Control Entity


  • To add an element to the currently-open diagram, click on the appropriate icon and drag it into position on the diagram; set an element name and other properties as prompted
  • To add a relationship, click on the appropriate icon, then click on the start element in the diagram and drag to the end element

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