How to Define Incident Severity Levels That Work
Incident severity levels exist for one reason: so that a responder who was asleep ninety seconds ago can decide, without debate, how many people to wake up. Everything else (the reporting, the SLA math, the quarterly review slides) is downstream of that one decision. If your scale cannot be applied in under thirty seconds by someone with partial information and no context, it is not a severity scale. It is documentation.