Dispatcher is an interactive system that shows these routes toSharon for her approval or modification. (For example, the com-puter may not know that flooding has made a particular route in-feasible.) After Sharon approves these routes as attractive possi-bilities with reasonable time estimates, Dispatcher next formulatesand solves a BIP model for selecting three routes that minimizetheir total time while including each delivery location on exactlyone route. This morning, Sharon does approve all the routes