Never leave with shared ownership of action items.
Shared ownership is no ownership. One person must own each deliverable in cross-functional projects. Others may support, contribute, or coordinate—but accountability sits with a single individual. This clarity prevents the finger-pointing that kills cross-department initiatives.
Take Action: Review your current cross-functional projects. Identify any action items with multiple owners. Today, reassign each to a single person. Email them confirming they own it, copying others who will support.