Last 12th June, the OECD launched a consultation on its “best practice principles” on regulatory impact assessment (RIA). The paper extends and elaborates the 2012 “Recommendation of the Council on Regulatory Policy and Governance”, with the aim of providing member countries with a practical instrument to better design RIA systems. Although not particularly innovative in content, the “principles” outline some of the most recent trends in the international debate over RIA, such as a focus on governance issues and on the evaluation of non-economic impacts (Siriana Salvi, in Rassegna trimestrale dell’Osservatorio AIR • ottobre 2019 X/4).