Flow of Events

A flow of events is a sequence of transactions (or events) performed by the system. They typically contain very detailed information, written in terms of what the system should do, not how the system accomplishes the task. Flows of events are created as separate files or documents in your favorite text editor and then attached or linked to a use case using the Files tab of a model element. See the Files Tab on page 49 for a discussion the Files tab.

A flow of events should include:

• When and how the use case starts and ends
• Use case/actor interactions
• Data needed by the use case
• Normal sequence of events for the use case
• Alternate or exceptional flows

You can use activity diagrams to further model flows of events.