Using variables to help roles in a race condition determine which path they should follow, is at best 
complex, and sometimes impossible to implement.

Mechanisms are required to help two parties decide on a common path through a distributed choice, 
when a race condition occurs. Similarly, mechanisms should also be investigated where multiple parties 
are involved in a distributed choice situation - although this will probably require at least one common 
role between all of the activities involved in the distributed choice. 

The aim should be to provide a simple business protocol definition in CDL, where clear semantic rules 
are defined to ensure that the implementations of the endpoints behaviour in a pre-defined 
(deterministic) manner.