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Planning & Processabbreviation · /sev wʌn/

SEV1

In simple English

In tech companies, incidents and bugs are classified by severity to determine response priority and resource allocation. SEV1 (Severity 1) indicates a production outage or critical failure that directly impacts end users or core business functions. When a SEV1 is declared, teams typically drop everything to resolve it, on-call engineers are immediately paged, and communication protocols are activated across the organization. This classification helps coordinate rapid response and escalation without ambiguity. SEV1 is often followed by SEV2 (significant impact, degraded service) and SEV3 (minor issues, workarounds available).

What does SEV1 mean in tech companies and when is it used?

At a glanceCEFR B2
Commonness4/5
Versatility4/5
FormalityCasualFormalNeutral
Spoken ↔ WrittenSpokenWrittenBoth
Directness ↔ DiplomaticDirectDiplomaticDirect
RegionUS and UK
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Say it like this

✓We have a SEV1 on our hands.
✓This needs to be escalated to SEV1.
✓All hands on deck for the SEV1.

Real examples

in a standup

"We declared a SEV1 yesterday when the database went offline, and engineering worked through the night to restore service."

in an incident call

"SEV1 is active—everyone should be on the bridge, and we need an ETA on the fix."

in a Slack message

"The authentication service is down in production. Marking this as SEV1."

Don't say this

Handle with care. SEV1 is not a verb; you do not 'SEV1 something.' Instead, you classify an issue as SEV1 or declare SEV1 status. Avoid confusing severity levels (SEV1, SEV2, etc.) with priority levels.

✕We need to SEV1 this bug.
✓We need to classify this as SEV1 or declare this a SEV1.— SEV1 is a noun or classification label, not a verb. You classify something as SEV1, you do not perform an action called SEVing.
✕This is a SEV1 issue because it is annoying.
✓This is a SEV3 issue because it is annoying. SEV1 is for production outages affecting all users.— SEV1 is reserved for the most severe incidents. Minor inconveniences are SEV3 or SEV2.
✕That feature request is a SEV1 priority.
✓That bug fix is a SEV1 incident.— SEV1 classifies incidents and production issues, not feature requests or planned work.

Other forms

noun

SEV1

"We declared a SEV1 when the API stopped responding."

noun

SEV1 incident

"The team handled the SEV1 incident professionally and restored service within two hours."

noun

SEV1 status

"The system is currently in SEV1 status due to the outage."

Often used with

declare a SEV1To officially announce that an issue has reached the highest severity level
escalate to SEV1To upgrade an issue from a lower severity classification to SEV1
SEV1 incidentThe standard phrase for a severity 1 emergency
SEV1 on-callThe engineer or team member responsible for responding immediately to critical incidents
page SEV1To send an urgent notification to on-call staff about a critical incident

Similar words

critical incidentMore formal; describes the same concept but without the specific severity classification numbering
production outageOften the cause of a SEV1; refers specifically to downtime affecting live systems
all-hands incidentEmphasizes the response rather than the severity classification itself

Opposites

SEV3SEV2non-critical

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Practice

Try it

4 quick exercises

Pick the most natural phrasing

1. Your payment system is down and no customers can complete checkout. How do you communicate this?

Complete the sentence

2. When the database crashed and took down the entire service, the team quickly _______ and assembled an incident response team.

Spot the mistake

3. Which sentence uses SEV1 incorrectly?

Rewrite naturally

4. Rewrite this using SEV1: 'The main service is broken and nobody can use it. We need the highest level of emergency response.'

Questions

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