This video explains the quantification of changes to mitigate delay to the critical path.
Planned Impacts may also be called mitigation or recovery. Planned Impacts in SmartPM is how changes to the remaining planned work have affected the end date. Often when there are delays, we try to recover or accelerate the remaining work to move the end date back in. Durations are shortened, logic ties are switched, and work is re-sequenced. Conversely, changes could be made to the plan side to add time and push the end date out. Adding extended change orders or time extensions, or future looking fragments into the plan side of the schedule, could cause the end date to extend. In cases of where time is added to the schedule, SmartPM will represent this as negative acceleration with a negative number.
If you click on the 'Planned Impacts' section in the company dashboard, you will be brought to the Changes tool of the chosen project-
