A method of scheduling and making material time balancing decisions for a set of balanced tasks. The method includes steps of scheduling a first task from among the set of tasks, maintaining a reversible buffer over the interval, values of which over the time interval define a buffer profile. The buffer profile indicates the balance of items consumed by already scheduled tasks over the time interval. The next task to be scheduled is then selected from among all schedulable tasks of the set of tasks. A schedulable task is defined as a task that produces a quantity of items that is less than or equal to the balance of items consumed by the already scheduled tasks, as indicated by the buffer profile. The selected task may then be scheduled such that the end time of the selected task is latest.