he article presents the method of description of specific organizational form by the indicator called a “corporation index”. The paper consists of five sections. The Introduction contains the approximation of the concept of the corporation as an economic organization. The theoretical formulation of the corporation by using its external and internal environment is given in Section 2. In Section 3 the theoretical formulation of the ‘corporation index’ is presented and the elements which are necessary to understand the idea of this notion are described. Section 4 is the report on the construction of the corporation’s index for measurable features. Moreover, it contains the results of market research comprising annual reports of companies from 1999 to 2003. The ‘threshold values’ for all indicators from corporation’s index are also given. The results are summarized in Section 5. The annex to the paper contains data obtained as a result analysis of the companies’ annual reports necessary for obtaining ‘threshold values’ for all indicators.