Other processes may by their nature be different in some way in nearly every implementation. These situations must be carefully handled if a reasonable benchmark is to be executed. Simply because the same product is produced in a number of plants, it does not necessarily follow that similar technologies are being utilized. For instance, some technologies may be more energy efficient, at higher capital cost. In other cases, an older plant may use a different configuration that makes technical comparisons of specific energy inappropriate, since a revamp to reduce specific energy is not practical.