The work is based on the research of business rules classification and specification methods. The basics of business rules approach are discussed. The most common business rules classification and modeling methods are analyzed. Business rules modeling techniques and tools for supporting them in the information systems are presented. Basing on the analysis results business rules classification method is proposed. Templates for every business rule type are presented. Business rules structuring process is shortly described. Business rules repository architecture, which is based on the proposed classification method, is presented. Proposed repository can store all types of business rules of defined classification method. Rules in the database are stored linked with events which are grouped by business functions. Such rules storing makes repository structure more flexible and more adaptive in information systems. Repository can function as an independent database for storing business rules and can be fully integrated in to the rule based information system. Rule specification tool for business rules registering and viewing was created. This tool has a simple user interface which allows register business rules and provides first steps in formalizing business statements. Finally conclusions are presented.