we have considered cost allocation from a single support department to several producing departments. We used the direct method of support department cost allocation,in which support department costs are allocated only to producing departments. This was appropiate in the earlier example because on other support departments existed. This would aslo be appropriate when there is no possibility of interraction among support departments. Many companies do have multiple support departments and they frequently interact. For example, in a factory, Personnel and Cafeteria serve each other, other support departments, and the producing departments.