If preventive controls cannot be implemented due to technology limitations, the first step to reduce risk is to evaluate alternative controls. Alternative controls are those that can achieve the same or similar objectives as the original preventive controls, but using different methods or technologies. For example, if a firewall cannot be installed due to hardware compatibility issues, an alternative control could be a network segmentation or a proxy server. Evaluating alternative controls requires assessing their feasibility, effectiveness, efficiency, and cost-benefit. Redefining the business process, developing a plan to upgrade technology, and defining a process for monitoring risk are also possible actions to reduce risk, but they are not the first step, and they may not be feasible or desirable in some situations. References = Risk and Information Systems Control Study Manual, Chapter 4, Section 4.3.1, page 4-23.