Regulations help governments support economic growth, social welfare and environmental protection. The challenge is to design clear, coherent, and efficient regulations and to effectively implement them. This report presents cutting-edge thinking in how to facilitate good regulatory design and implementation. Jointly developed by the OECD and the Korea Development Institute, the report builds on a series of expert papers that analyse the experience of Korea and other OECD members in designing and implementing regulatory oversight, stakeholder engagement, regulatory impact assessment and ex post evaluation. It identifies forthcoming challenges, possible solutions and areas for further analysis that can help governments in OECD member and partner countries improve their regulatory systems.