Systems approach, contingency theory, modeling and interviewing are used to research whether the integration of the financial accounting and budget systems that are based on different accounting principles into a balanced overall system will increase the efficiency of financial management and will provide more ways of management in Estonian public organizations. The integration of the systems will create a semantically and organizationally interacting information system for a midterm period, which could be used at all managerial levels in all organizations in real time by developing the information technological infrastructure in Estonia. As feedback, control authorities impart information about the deviations between the objectives of the information and the attainments to the decision-makers, which will enable the decision-makers to make corrections and improve the quality of decisions.