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.
Use it at work
Declaring
- This is a SEV1. Payments are down.
- I'm opening a SEV1 incident.
Responding
- For a SEV1, the incident commander joins right away.
- Leadership gets updates every 30 minutes on a SEV1.
Reviewing
- We had one SEV1 this quarter.
- Every SEV1 needs a post-mortem.
Don't say this
SEV1 is a noun or classification label, not a verb. You classify something as SEV1, you do not perform an action called SEVing.
Don't mix it up
| Term | What it is | Who writes or uses it | When |
|---|---|---|---|
| SEV1 | Most severe incident | Ops, on-call | Major outages |
| SEV2 | Serious but limited impact | Ops | Partial issues |
| P0 | Highest priority work item | Product, engineering | Critical bugs |
Practice
Try it
4 quick exercises
1. Your payment system is down and no customers can complete checkout. How do you communicate this?
2. When the database crashed and took down the entire service, the team quickly _______ and assembled an incident response team.
3. Which sentence uses SEV1 incorrectly?
4. Rewrite this using SEV1: 'The main service is broken and nobody can use it. We need the highest level of emergency response.'
Say it out loud
Phrase 1 of 3
"We have a SEV1 on our hands."
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More about SEV1
Real examples(3)
- 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."
More mistakes(2)
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.
- ✕This is a SEV1 issue because it is annoying.✓This is a SEV3 issue because it's 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(3)
- SEV1 noun
"We declared a SEV1 when the API stopped responding."
- SEV1 incident noun
"The team handled the SEV1 incident professionally and restored service within two hours."
- SEV1 status noun
"The system is currently in SEV1 status due to the outage."
Often used with(5)
- declare a SEV1 · To officially announce that an issue has reached the highest severity level
- escalate to SEV1 · To upgrade an issue from a lower severity classification to SEV1
- SEV1 incident · The standard phrase for a severity 1 emergency
- SEV1 on-call · The engineer or team member responsible for responding immediately to critical incidents
- page SEV1 · To send an urgent notification to on-call staff about a critical incident
Similar words(3)
- critical incident · More formal; describes the same concept but without the specific severity classification numbering
- production outage · Often the cause of a SEV1; refers specifically to downtime affecting live systems
- all-hands incident · Emphasizes the response rather than the severity classification itself
Opposites(3)
- SEV3
- SEV2
- non-critical
Questions(6)
- What does SEV1 mean in software engineering?
- SEV1 stands for Severity 1 and is the highest level of urgency classification for system incidents in tech companies. It indicates a critical failure that directly impacts users or core business operations and requires immediate resolution.
- When is something classified as SEV1?
- An issue is classified as SEV1 when it causes a production outage or critical failure affecting all or most users, prevents core business functions, or results in data loss. Examples include database crashes, authentication service failures, or payment system outages.
- What is the difference between SEV1, SEV2, and SEV3?
- SEV1 is a production outage affecting all users; SEV2 is significant impact with degraded service affecting some users; SEV3 is a minor issue with available workarounds. SEV1 requires immediate response, SEV2 requires urgent response, and SEV3 can be scheduled into normal work.
- How do you use SEV1 in a sentence at work?
- Common usage: 'We declared a SEV1 when the API went down,' or 'This needs to be escalated to SEV1 status,' or 'The SEV1 incident was resolved in two hours.' Avoid using it as a verb: do not say 'we need to SEV1 this.'
- Is SEV1 formal or informal?
- SEV1 is neutral in formality. It is professional jargon used in incident reports, Slack messages, emails, and meetings. While technical, it is standard workplace communication in software companies.
- What happens when a SEV1 is declared?
- When SEV1 is declared, on-call engineers are immediately notified (paged), an incident command bridge is opened, team members drop other work to focus on resolution, and communication updates are sent regularly to stakeholders until the issue is resolved.
