What’s one visual tool that helped you break down project complexity?

As projects become more interconnected—whether in manufacturing, tech, or services—I’ve found that visual tools often reveal insights that structured documents don’t.
For instance, I recently used a SIPOC + swimlane combo to align procurement, production, and safety teams during a plant upgrade. The visual helped surface role overlaps and hidden delays, making coordination smoother.

What visual frameworks do you rely on—mind maps, process flows, stakeholder maps, or something else?