A responsive plan is a plan we keep adjusting to unplanned and unpredictable knowns and unknowns.
This is the opposite of an unresponsive plan, a plan based on assumptions that we try the best we can to follow. In this world, success is measured as plan compliance.
Responsive plans are based on questions. Questions work because the only thing we have in abundance with plans is uncertainty. Questions translate unknowns into actions that make progress towards our interests possible.