Change coupling · Feedback latency
Branches live hours, not weeks
Keeping branches short forces changes to be small, and small changes are cheaper to review, cheaper to bisect, and cheaper to revert — the coupling cost is paid at branch length rather than at merge.
Do this firstEvery change runs the suite before a human looks at it
A branch that lives a day cannot contain a change that takes a week. That is the mechanism: the constraint is on duration, and it acts on size.
This one is often adopted as a merge policy and abandoned as an unpleasant one, because a team whose changes are naturally large experiences short branches as an instruction to work faster. If that is your team, the sequencing matters — flags first, so a partial change can ship turned off, and then the constraint becomes possible to satisfy rather than a rule to route around.
The decoy
A well-run long-lived branch with regular merges from trunk. The merges keep it building; they do not make the change smaller, and size is the variable that matters.
Evidence
- 2017 State of DevOps Report — IITeams that merge to trunk at least daily, keep branch lifetimes under a day, and maintain fewer than three active branches report higher delivery performance, with the difference stated as statistically significant and replicated across two consecutive years: high performers' branch life and integration typically last hours, low performers' days.
- Accelerate: State of DevOps 2019 — IICluster analysis separates self-described delivery performance into distinct profiles, and continuous delivery capabilities — trunk-based development, automated testing, deployment automation, loosely coupled architecture — predict cluster membership in a PLS-SEM model.
Last reviewed 2026-08-19.