From both a research and policy perspective, it is vital to be able to accurately measure EPL in order to determine its labour market impacts, identify best practices and assess reform progress. The OECD has published estimates of the strictness of employment protection in member countries since the early 1990s (Grubb and Wells, 1993, OECD, 1994, 1999, 2004, Venn, 2009). This chapter presents the latest estimates for OECD and selected emerging economies (including all G20 countries). They are the result of a comprehensive effort to update the indicators, based on a more accurate collection methodology and taking due account not only of legislation but also of national or branch-level collective agreements and case law, where relevant.