First consider ROI, and identify those strategies that have relatively high ROI. Then ask whether those strategies can be scaled to achieve the stated minimum goal. If not, the high ROI strategy might still be pursued, but would need to be supplemented with additional strategies to achieve the minimum goal. For example, eliminating over-application of fertilizer could be a high ROI strategy for reducing nutrient pollution (e.g. by educating farmers to reduce inputs and increase their profits). However, this might only lead to a 10% reduction in nutrient pollution, short of the 40% minimum goal. In this case, consider supplementing the high ROI strategy with additional strategies.