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The research work presented here includes reengineering needs and process framework. It also includes various works that has been done in the field of extraction of business rules from legacy C++ source code. Therefore, here proposed method is implemented to extract a business rule from legacy C++ source code. Here we can extract information from legacy code and again do the re-engineering in the existing system without making new system. So, by applying concept of extracting information from legacy code like business rules we can understand and revert back to the design part of any code.