From pages 12 & 13:
Tip #3—Use Change Management Appropriate for an Upgrade
During an upgrade, it is imperative to freeze metadata and system data in your production environment. With respect to the new release, ensure all relevant patches available are applied appropriately. There are two types of new release patches to manage throughout the upgrade project: "required for upgrade" patches and "regular product" patches. For each upgrade pass, required for upgrade patches only are applied to your upgrade environment. For each user acceptance test rollout or environment, apply regular product patches to the test environment only and never to the upgrade environment. Failure to appropriately manage these different
change management requirements can result in upgrade step failures and unexpected user acceptance test results.
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