This UML Interaction Overview Diagram is similar to the activity diagram in that they both depict activities. The difference is that each activity is defined as a frame that can contain a nested interaction diagram in an interaction overview. As a result, the interaction overview diagram is useful in deconstructing a complex scenario that would otherwise necessitate multiple if-then-else paths to be depicted as a single sequence diagram. The remaining notation elements for interaction overview diagrams are identical to those for activity diagrams. The initial, final, decision, merge, fork, and join nodes are examples.
