In this study the synergetic effects of production, financial and marketing planning are of interest. It is shown how a corporate model can effectively serve as a tool in the process of integrating and coordinating production, financial and marketing plans. When the outputs of the corporate model are combined with a hierarchical evaluation procedure the congruent objectives are found. The evidence from the study is that the quality and quantity of information for corporate strategic decision making can be fundamentally extended by such a computer-based integration. This kind of management information system combines traditional data, subjective evaluations, and planning models interactively in order to improve the effectiveness of a manufacturing firm.