A complex process of defining the informational basis of a business system in the early stage of development has been presented in this work. In order to give a better view of the size of this critical process in the business system management, the first part of the thesis showed the developed informational basis of the business system which was analysed through three different perspectives. The first perspective focused on the segments of the informational system based on the functional groups, thus creating a better perception on the information system model irrespective of the technical implementation details. The second perspective provided details on the technologies used to build the informational basis and its cost, while the third one focused on components expenditure weights. In the second part of the thesis the discussed information system model was redefined and upgraded taking the good practices of the selected information system and the new technologies which enable expenditure optimization into account. The main goal of redefining the information system model was to reduce the complexity and expenditure in the non-profit segments, while increasing investments in the segments where new or added values are created. The results of this work showed that, with the thorough analysis of the technology used to create the information system, it is possible to significantly cut the cost of building such an information system while also obtain a more organized, more flexible and a higher quality system.