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Technical Vocabularynoun · /ˈkeɪ.ɒs ˌen.dʒɪ.ˈnɪə.rɪŋ/

chaos engineering

In simple English

Chaos engineering is a proactive approach to building reliable systems by simulating real-world failures in a controlled environment. Rather than waiting for problems to occur naturally, engineers deliberately inject chaos—such as shutting down servers, introducing latency, or corrupting data—to observe how the system responds. This practice emerged from large-scale cloud companies like Netflix and is now standard at organizations that prioritize system reliability. In tech workplaces, chaos engineering is used to validate monitoring systems, test failover mechanisms, and ensure that applications can gracefully degrade under stress. Teams might run chaos experiments weekly or before major releases to build confidence in their infrastructure.

Understand what chaos engineering is, why companies use it, and how to implement it in your systems.

At a glanceCEFR C1
Commonness4/5
Versatility4/5
FormalityCasualFormalNeutral
Spoken ↔ WrittenSpokenWrittenBoth
Directness ↔ DiplomaticDirectDiplomaticDirect
RegionUS and UK
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Say it like this

✓Let us run a chaos engineering test on the payment service.
✓Chaos engineering helped us catch that bug before it reached production.
✓We practice chaos engineering to ensure our systems are resilient.

Real examples

in a standup

"Yesterday we completed a chaos engineering experiment where we killed three database instances to see how the application would handle the failure."

in a code review

"Before we merge this change, we should run chaos engineering tests against the new load balancer logic."

in a team meeting

"Chaos engineering revealed that our alerting system was not properly configured to detect cascading failures across regions."

Don't say this

Handle with care. Do not confuse with general system testing; chaos engineering specifically involves intentional failure injection. Do not use as a metaphor for disorganization.

✕We used chaos engineering to test the code functionality.
✓We used chaos engineering to test the system's resilience to failures.— Chaos engineering tests how systems fail and recover, not basic functionality. Use unit tests or integration tests for functionality.
✕The deployment was chaotic, so we did some chaos engineering.
✓The deployment was chaotic, so we implemented chaos engineering practices to prevent future failures.— Chaos engineering is a deliberate, structured practice, not a description of disorder or poor planning.
✕Chaos engineering means we run tests randomly.
✓Chaos engineering means we deliberately inject controlled failures to test system resilience.— Chaos engineering is methodical and planned, not random. Experiments must be designed and monitored.

Other forms

noun

chaos engineering

"Chaos engineering is essential for building resilient microservices."

verb (gerund)

chaos engineering

"By chaos engineering the database layer, we discovered the connection pool was undersized."

adjective (attributive)

chaos-engineering

"Our chaos-engineering practices help us maintain 99.99% uptime."

Often used with

chaos engineering experimentA planned test where specific failures are introduced; commonly used to describe individual chaos tests.
chaos engineering toolSoftware used to inject failures, such as Gremlin, Pumba, or Chaos Monkey.
chaos engineering practiceThe overall organizational approach and culture of regularly running chaos experiments.
run chaos engineeringTo execute or perform a chaos engineering test or experiment.
chaos engineering frameworkA structured methodology or set of principles for designing and executing chaos experiments.

Similar words

resilience testingBroader term; chaos engineering is a specific type of resilience testing that uses intentional failure injection.
failure injection testingSimilar concept; focuses on injecting faults, though chaos engineering emphasizes complex, distributed scenarios.
fault tolerance testingEvaluates how systems respond to faults; chaos engineering is a proactive method of fault tolerance testing.

Opposites

deterministic testingstatic testingblackbox testing

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Practice

Try it

4 quick exercises

Pick the most natural phrasing

1. Your infrastructure team wants to test system resilience. How would they phrase it naturally?

Complete the sentence

2. We should _______ chaos engineering before rolling out the new version to production.

Spot the mistake

3. Which sentence uses chaos engineering incorrectly?

Rewrite naturally

4. Rewrite this in natural tech English: 'We need to break our system on purpose to see if it can handle problems.'

Questions

Quick poll

Have you said "chaos engineering" in a standup this week?

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