How do you measure? | Support Group First Response SLA Breached for tickets handled by multiple support groups

How do you measure? | Support Group First Response SLA Breached for tickets handled by multiple support groups

We have a bunch of incident and request tickets that transfers from one support group to another support group. I want to measure the first response of each support group who handled the ticket.

Real-life scenario:
  1. Requester raised a ticket to report that she has slow Internet connection on her workstation.
  2. Service Desk took ownership of the ticket and found that this issue requires a site visit.
  3. Service Desk assigns the ticket to the Onsite technician.
  4. Onsite technician then assigned the ticket to Level 2 Network team for escalation after assessing the issue during site visit.
  5. Level 2 Network team resolve the ticket.

Questions:
  1. How long did it took for Service Desk (SD) to respond to the reported issue after ticket creation?
  2. How long did it took for Onsite technician to  respond to the reported issue after SD endorsed the ticket for site visit?
  3. How long did it took for Level 2 Network team to respond to the reported issue after Onsite technician endorsed the ticket for network wide checking.

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