With many companies pulling back on investments and commitments to sustainability, monetary justification becomes critical if we are to move forward from the status quo. Sustainable Return on Investment is an evolving method which has been successfully used to assess these types of investments, providing companies and investors with justification beyond “doing good.” For example, Dow Chemical uses the method to assess their sustainability goals; the Japanese Government has used it to determine which biofuels to invest in further, and other companies have used it to determine whether to invest in efficiency upgrades and other, relatively small projects. This 3-hour workshop will provide an introduction to S-ROI, provide a small exercise and discuss the status of methodology development and its strengths and weaknesses.