Bid rigging is one of the worst infringements of competition law, as it implies a cartel related with public procurement. This has quantitative and qualitative implications, as it affects a relevant percentage of the GDP of the countries and affects relevant services for the citizens. Those practices are most of the times hidden and very difficult to detect for the agencies. When detected, they are not easy to proof. Therefore, the seminar will focus on the different concepts and practices that fall under the concept of bid rigging, the tools for detection and the different means for creating strong cases. Experts from OECD countries will present case studies, and participants will practice their skills in hypothetical exercises.