manager should carry a raw material inventory in terms of projects. This is not to be confused with his work-in-process inventory, because that, like eggs in a continuous boiler, tends to spoil or become obsolete over time. Instead this inventory should consist of things you need to do but don’t need to finish right away—discretionary projects, the kind the manager can work on to increase his group’s productivity over the long term. Without such an inventory of projects, a manager will most probably use his free time meddling in his subordinates’ work.
