The problem of allocating indirect costs is considered the most important problem that was and still in the focus of many researches. According to the disagreement with the results of methods applied in the allocation of those costs,
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especially as the objectivity and fairness in the allocation of those costs greatly affect the cost accuracy but also on the accuracy of the cost data system in general. The allocation of indirect costs represents the decisive step to get accurate costs for products or services. It also represents the main goal of the study to provide a model for a trade-off between the methods of indirect cost allocation by determining the degree of complexity of methods of indirect cost allocation, and the factors that influenced and associated with the external and internal environment of the institution. The study has found that there is no typical model system can be applied equally in all institutions and circumstances. However, some of the attributes of a suitable system will depend on the specific circumstances of the institution. The extent of effectiveness of the system depends on its ability to adapt to changes in the external and internal conditions. The study also concluded that it must rely on an integrated basis for judging the objective methods of indirect costs allocated to help to increase the value of the information provided to beneficiaries