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In many service organizations, scheduling is complicated because service demand— quantity, type of service, and timing—is often variable and hard to forecast. In addition, inventories may not be possible and capacity is limited. For example, a movie theater cannot show the movie before the customers arrive and hope to satisfy demand. The theater is also limited as to how many people can occupy the theater at any given time. Because of these constraints, some additional techniques are available for scheduling services. These include scheduling the services demanded and scheduling the workforce.