Regulations are meant to support economic growth, social welfare and environmental protection. The challenge is to i) design clear, coherent, and efficient regulations; ii) to effectively implement them; and iii) continually evaluate them for their appropriateness, relevance and impact. This report presents cutting-edge thinking and latest practices on how to facilitate good regulatory design and implementation. Jointly developed by the OECD and the Korea Development Institute (KDI), the report analyses the experience of Korea and other OECD countries in designing and implementing regulatory oversight, stakeholder engagement, regulatory impact assessment and ex post evaluation. It also identifies forthcoming challenges, possible solutions and areas for further analysis that can help governments improve their regulatory systems.