In “administrative units”, services to patients are not offered directly. Then, based on its assigned duties in the hospital, each subdivision can be considered as an activity center. For example, “accounting department” is divided to three activity centers: 1-patients accounting, 2- salary accounting, 3-capital goods accounting (Fig. 2). Thus, its costs should not be allocated to these activity centers. Activity center of “patients accounting” only provides services for released patients. It is obvious that all costs of these centers should be allocated only to discharge patients (cost object). However, “salary accounting” activity center accounts the personnel’s salary in the hospital. So, its costs should be allocated to the personnel of this division.