L1 handles basic troubleshooting and FAQ-level issues — password resets, "how do I," and known-issue lookups, usually resolved in a single interaction. L2 manages complex software and configuration issues that require deeper product knowledge or reproduction steps. L3 handles escalations requiring engineering-level expertise, typically bugs or edge cases that need code-level investigation.
The tiering only works if intake is disciplined — every ticket gets triaged against clear criteria before it is routed, instead of defaulting upward whenever an L1 agent is unsure.



