Hi Marc - we utilize the Baseline functionality in Workfront.
First, we have it setup that a baseline is automatically created the first time you move a project into Current status (Setup -> Project Preferences -> Projects). This captures what was supposed to happen.
If the changes a PM makes are just to the timing, that is fine. They update the project schedule. We just compare slippage to that first baseline.
If the changes require adding more tasks, then the Project Manager should save a new baseline first before adding the new tasks. Ideally, if new tasks need to be added, that will mean more hours so there should be a revised scope of work created that the client and finance needs to approve. When the scope is revised, the timing of the tasks already completed will be considered (and the actual hours used).
Hope that helps.
