This step-by-step process for upgrading the Windchill system covers steps that must always be done; however, there may be unique steps that are specific to your site that should be recorded in a work instructions document. For example, you may want to extrapolate upon some instructions to include details such as machine names, database names, and file locations that are specific to your upgrade. Keep the work instructions document updated so that it can be a repeatable process for subsequent test upgrades and production upgrades.