The articles on which Chapters 4, 5 and 6 are based are available Open Access under CC-BY-NC licence. Design approaches to policy-making have gained increasing popularity among policy makers in recent years. First published as a special issue of Policy & Politics, this book presents original critical reflections on the value of design approaches and how they relate to the classical idea of public administration as a design science, with a new concluding chapter. Contributors consider the potential, challenges and applications of design approaches and distinguish between three methods currently characterising the discipline: design as optimisation, design as exploration and design as co-creation. Developing the dialogue around public administration as a design science, this collection explores how a more ‘designerly’ way of thinking can improve public administration and public policy.