How can cartels be detected effectively and what are the first steps when a suspicion arises? We will look at leniency but also pro-active detection tools like the analysis of public procurement data. Next steps will involve covert market investigations and dawn raids and what kind of evidence to look for, as well as how to organise it in order to convince appeal courts. Lastly, we will also discuss the relevance of monetary fines. Experts from OECD countries together with FAS experts will present their best practices and insights and will address problems and questions raised by the participants.