摘要：Software maintenance effort is playing a very important role for the development of the software. In maintenance phase user request for change and effort required for the maintenance of software is more as compare to the over all development of the software. Enhanced maintenance is very important factor among all factors in the software maintenance. In maintenance effort distribution, about fifty percent (50%) of effort consume by the Enhanced maintenance. To reduce these effort additional requirements manipulation model is used. Additional requirements manipulation model is the modular library of Design, coding and testing of functional, non-functional and the domain requirements. Although additional requirement manipulation is reduce the Enhanced maintenance model effort. But highly risk is involve in addition of a new module or replacement of the module form the existing software on user request to reduce the risk RMMM (Risk Mitigation, Monitoring and Management) Plan as to use for the review of the risk and for the risk planning
