What Makes a Good Check-in?

A good check-in is presented as the basic unit of work in a version-control system. It should move a project from one buildable and tested state to the next, preserve history, and include enough information for review, debugging, and later backout.

Reading notes

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• A check-in should have one purpose, not serve as a backup for unrelated local changes.
• Small scope makes changes easier to review, verify, undo, and move to another branch.
• The description should explain the intent and scope, with a short first line that gives an overview.
• A good check-in keeps the project buildable and tested, and includes tests with the change.
• It should also include all changes needed to build, test, and update related documentation.
• Pre-check-in review helps catch mistakes, enforce standards, and check for side effects before committing to the shared repository.
• Traceability matters in regulated settings, where authorship, date, authorization, and issue links may be required.
• Reversibility is important because later testing can still expose unwanted side effects.
• The article recommends check-ins that are small, well described, and complete enough to make review and maintenance easier.