Change Failure Rate: Why 15% Is Normal and 0% Is Suspicious
· 9 min read
When a VP of Engineering tells me their Change Failure Rate is 0%, I don't congratulate them. I ask what they're not counting. Stripe's 2018 "Developer Coefficient" study estimated that $300 billion is lost globally to bad code and inefficient processes — and much of that loss hides behind unrealistic quality metrics. A 0% CFR almost always means the team either deploys so rarely that each release is over-tested to the point of paralysis, or — more commonly — they have a definition of "failure" so narrow that real incidents don't qualify.