One of the important aspects of ERP both for practitioners and researchers are the “implementing considerations”. While companies worldwide have spent considerable investments on the ERP systems, but they've confronted unexpected problems and realization of its final benefits is blurred. In order to implement ERP with minimum risk and assured ROI, it’s necessary' to identify the organizational parameters affecting it positively or negatively. This study aims at describing proper organizational conditions for this organizational system, for Iranian manufacturing industries, and Irankhodro Company as a case. This organizational condition has been investigated in an organizational Architecture framework. OA has been viewed from a plan/design view and the research model has been developed as a variable called design coherence and its effect on the ERP success. Design coherence, is the coherence between HR attitudes about the dimensions of the organization and the real design. The results show that in the proper OA for ERP there exists design coherence. This finding is verified through existing evidences obtained from past studies. Regarding the case company, Irankhodro we can say that the aforementioned organization should move toward this coherence in order to preparation for ERP. Managing the system reliability regarding the organizational information systems (EISs) is an important consideration which merit attention for maximizing the benefits of investigation on such an expensive information system called ERP.