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| subject > event > internal event | 
| internal event comparison table | ||||
| Subject | is a kind of | cause | have example | has definition | 
|---|---|---|---|---|
| event | subject | a system or object to change from one state to another | In a state diagram, something that causes a system or object to change state. May be a message, the passage of elapsed time, a condition becoming true, or completion of an activity | |
| internal event | event | most transitions in an activity diagram | completion of an activity | An event caused within a component, such as completion of an activity | 
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