This chapter addresses the regulatory practices of Australia, Canada, Mexico, and the European Union. In the case of countries such as Australia and Canada, the law does not require preparing a Regulatory Impact Assessment, but it is laid down in specific guidelines that oblige public entities to carry it out. In addition, it explains the criteria employed to define when it has to be performed and its level of analysis. Finally, it outlines the steps that are followed in different countries to prepare the RIA, as well as the cases in which the public consultation is used and how it is conducted.