Chapter 2. Methodology

This section briefly describes the methodology for the 2018 Environmental Performance Index. For a more general and authoritative explanation of composite indexing, we refer the reader to the Organization for Economic Coöperation and Development handbook on the subject(Nardo et al., 2008). Hsu et al. (2013) explain the general process of constructing the EPI. Further details about the data and calculations are in the online Technical Appendix.