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

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.

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

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

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

Possible Global Traces 1 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