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when i worked for rockwell collins (now collins aerospace), we had a review application written using DOS batch files and it didn't matter how small a code change was, we had to put a description in the application, print out the old code, the new code, a description of the change and why it was changed. that old and new code was then passed to every person on the team and they were required to review and sign off on it. if any part of the change was questioned by another team member, the developer who wrote it had to review the comments or questions and repeat the entire process all over again.the rule was that a design change that altered the description of the section (as opposed to bug fixes that didn't change intent) HAD to be reviewed by the group for understanding and agreement that it was (a) effective and (b) necessary or at least appropriate.
that company worked with critical software though: embedded systems that guided commercial airplanes, ran military equipment, etc... we also had numerous government documents for which there were development requirements we were bound by. that was the best job i ever had, but it was the worse at the same time.