1. Sequence Diagram Traces
or why sequence diagrams are “hard” to use when
generating code

2. What is always true on Sequence Diagrams
- The send event must occur
before the receive event Events are strictly ordered along one lifeline, however,
the distance between events on a lifeline is insignificant.
How many global traces are there in this diagram? Same diagram gives several global traces.

3. Numbering The Events 1 2 4 3 5 6 7 8 10 9 11 12 14 13

4. Some Dependent Events (ordering some events)1 2 4 3 5 6 7 8 10 9 11 12
10 is also independent
of 12, 13 and 14 14 13

5. Possible Global Traces - Independent Events:1 2 4 3 5 6 7 8 10 9 11 12
10 is also independent
of 12, 13 and 14 14 13

6. Possible Global Traces1 1
Possible Global Traces 2 2 … 4 3 5 6 8 7 9 8 } 10 10 11 11 11 11 9 11 12 11 10 12 12 12 14 13 12 12 10 13 13 13 13 13 10 14
one possible ordering 14 14 14 14 10