Accounts ranked by silence: days since the last email in either direction, the last meeting on anyone's calendar, and the last movement on their work. Silence across all three at once is what makes the list.
Everything here lives on a board with the Pulse above it: the line that reads the whole board and says what changed, what needs attention, and what to do next.
Edit the wording until it fits your business exactly. Two ways businesses bend this one: