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Unit 8: Advanced Interaction Modelling
8.3.2 Nested Activity Diagram Notes
An activity state may reference another activity diagram, which shows the internal structure of
the activity state. Another way to say this is that you can have nested activity graphs.
For example, you can either show the sub-graph inside of the activity state (Figure 8.8), or let the
activity state refer to another diagram (Figure 8.9).
Figure 8.8: A Nested Activity Graph Shown Within an Activity State
Source: http://gyan.frcrce.ac.in/~surve/OOAD/UCD/UCD_Relationships.html
Figure 8.9: Alternative Activity State Referring to another Activity Diagram
Source: http://gyan.frcrce.ac.in/~surve/OOAD/UCD/UCD_Relationships.html
Self Assessment
Fill in the blanks:
14. .................... conditions can be used to show that one of a set of concurrent threads is
conditional.
15. .................... graphs shows the internal structure of the activity state.
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