Project managers or other delegates will review each and every work paper. As part of the review process, they may upload attachments, insert notes and/or generate findings. The review process may take cycles of review and updates before it is considered complete. Each team can determine how best to drive their review process, with the Tasks being a primary candidate to facilitate review. Ultimately, the reviewer will update the review status and lock the work paper which prevents any changes to the analysis section.
See Review a Work Paper in the Project Workbench.