Final answer:
The usual escalation sequence during help desk incident management starts with Tier 1 for basic issues and moves up to Tiers 2 and 3 for more complex problems, sometimes involving Tier 4 for external support.
Step-by-step explanation:
The usual sequence of incident escalation during help desk incident management involves several stages. Typically, when an incident is identified, it first goes to a Tier 1 support team for basic troubleshooting. If the issue is not resolved, it escalates to Tier 2, where more experienced and specialized staff look into the problem.
For issues that are still not fixed, they move to Tier 3, which may involve engineers or developers with deep technical expertise. In certain cases, there may even be a Tier 4, which could involve external support or vendor-specific assistance.