Escalation at task Latest end date (Deadline monitoring)

[Cavies, Dale (ETSA)]

Using tasks within PM Service notifications our company wants to inform
employees of outstanding notification tasks for action via work flow.
Based on a notification task code and notification priority the business
would like to define deadline monitoring and escalation (3 levels).
 
We have a requirment to escalate (inform a superior person/ position)
if/when Workflow task creation date +x is reached, if/when Workflow task
creation date +y is reached and if/when Workflow task creation date +z is
reached.
 
I assume a modeled deadline should be used, but do I need to define a
separate task and modeled deadline for each Notification task code and
priority combination ?.
 
Regards,
 
Dale Cavies
ETSA Utilities
Information Systems
IT Delivery
 
*  Cavies.Dale at etsa.com.au