Three types of escalation exist :
1/ Invisible escalations : These escalations are executed if the condition indicated is fulfilled.
Their execution is totally transparent to the user and no history is maintained on them.
It is possible to compare them to a sort of conditional entry points.
2 / The archived escalations have been the object of a log in the executed escalation history
for a service request.
3/ The incremental escalations are archived and posted to the responsibility of the employee
in charge of the request at the time of its execution.