What is Code Churn?
Code that is rewritten or deleted shortly after being written.
Definition
Code churn measures code that is changed, rewritten, or removed soon after it was first committed (often within a few weeks). Some churn is healthy iteration; high churn can signal unclear requirements or quality problems.
How it’s measured
Compare lines added against lines later modified or deleted over a short window, from version-control history. Churn is best read as a trend and in context, never as an individual performance metric.
What good looks like
Elevated, sustained churn in a specific area often points to thrashing — unclear specs, rushed work, or a fragile component. A baseline level of churn is normal and expected.
Why it matters
Churn trends help locate where requirements or design need attention before they turn into rework and defects. It is a useful quality signal when paired with maintainability data, not a productivity judgment.
Related terms
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