Colin C. Williams is Professor of Public Policy in the Management School at the University of Sheffield. He has authored or edited over twenty books, including most recently Confronting the Shadow Economy: Evaluating Tax Compliance and Behaviour Policies (2014). He is Editor of The International Journal of Sociology and Social Policy.

1. Defining the informal economy2. Evolution of theories explaining the informal economy3. Measuring the size of the informal economy4. Characteristics of the informal economy5. Policy options and approaches6. Conclusions and future directions