What is the best way to address a large amount of missing and incomplete documentation spread over the course of multiple years? QA staff left suddenly, not on good terms, and apparently they were not closely supervised for quite some time. I've started a CAPA plan to identify the missing documents, and plan to categorize them by criticality and address them accordingly, either by redoing the work, or for things that happen on a scheduled basis, just waiting until the next scheduled event. I also plan to revise all QMS documents to require some form of secondary review and approval, and I'll be revising document control procedures to standardize storage and filing requirements. Any other suggestions or thoughts on how to adequately address this or ways to make it more manageable/less daunting would be greatly appreciated.