If the historical data about the operations of an organization can be systematically and continually used, the analysis of organizational behavior for management control will be much easier and effective. Based upon Ashby's concept of black box and protocol, the paper proposes an approach to reorganizing the historical data of an organization. A data model containing two time variables to represent the cycle time of operations in the organization and the time length for behavior analysis has been developed. Using this model, a new data base containing a) the data files of all protocols describing the input state and output state of the activities concerned and b) the numerical data files of the statistics of interactions between and/or among entities concerned can be created from historical data removed from daily operational data base (DODB). The evidence from a case study in a general teaching hospital in Taiwan shows that the proposed approach can be implemented and the use of historical data to support the analysis of organization's behavior analysis for management control can be realized.