26 Analysis should also be undertaken on potential benefits' shortfalls and increases in operating costs. If there is no evidence to support adjustments to operating costs or benefits' shortfalls, appraisers should use sensitivity analysis. This should help to answer key questions such as:
❑ By how much can we allow benefits to fall short of expectations, if the proposal is to remain worthwhile? How likely is this?
❑ How much can operating costs increase, if the proposal is to remain worthwhile? How likely is this to happen?
❑ What will be the impact on benefits if operating costs are constrained?