In my experience, synergy tracking is often managed through a combination of central IMO trackers (typically Excel or dashboard tools like Power BI) and regular governance routines.
The tool itself is less critical than the structure behind it. What tends to work well is having clear ownership for each synergy, defined timelines, and regular reporting cycles (e.g., weekly or monthly reviews). This creates accountability and keeps progress visible to leadership.
Where I’ve seen challenges is when synergies are tracked at too high a level without linking them to specific actions. In those cases, even with good tools, accountability weakens.
So overall, the effectiveness comes more from discipline in tracking and governance rather than the specific tool being used.