This chapter - focusing on the contributions of comparative law and the social sciences- will be concerned with what makes a comparison a good one- and how we judge what represents a good comparison in practice. It attempts to make progress in discussing these questions by focusing on the relationship between comparing and commensuration. It first defines and distinguishes the two terms and shows how they overlap. It then goes on to show why this overlap provides a key to understanding problems raised concerning the making and implementing of global social indicators. Finally, it discusses some of the ways that have been proposed to improving the accuracy and legitimacy of such indicators so as to provide 'good enough comparisons'. Paper: https://drive.google.com/open?id=1TcMk1Iqel2kpTbf-pJq5YN2ihu4tfFus