The availability and quality of evidence to be used in cartel cases is decisive for the successful initiation and completion of a cartel investigation. We will have a closer look at direct and indirect evidence to be used in cartel cases and at ways of obtaining it. Topics to discuss will be leniency systems, screening instruments, dawn raids and interviews. This seminar will give insights into best practices of experienced OECD countries with the use of these instruments (preparation, execution and assessment) and will provide opportunities to apply the learnings in hypothetical case exercises.