Résumé : This bookchapter is the result of a wider process organised, supported and financed by SCOPE (Scientific Committee on Problems of the Environment) under the auspices of ICSU (International Council for Science), the EEA (European Environment Agency) and the UNEP (United Nations Environment Programme). The objective of SCOPE was to gain a rapid assessment of the State-of-the-Art in terms of sustainability indicators at a crucial moment of the institutional and scientific discussion on these policy tools. The present chapter itself aimed to take stock of international expertise to approach and solve recurrent methodological problems with indicators (e.g. weighting schemes for composite indicators…). The participation to the process resulted in a series of international collaborations and research projects (OECD, FP7).