The Audit Trail of Estimates creates an audit log for every estimate change that occurs. The level at which changes are tracked is dependent on the method used for updating the estimate.
For example, a change made in Integrated Planning Baseline will track to the WBS/Resource level whereby an Import will be tracked at the project level, not at the detail level.
This audit log helps system and project administrators track who made what change to what data in the system. It also assists in tracking down change control problems. When changes are occurring in the database, the database administrators can go to this log and see who made what changes when.
Setting the Security Audit Trail Options