In this seminar we will present economic methods that can be helpful for competition authorities in the assessment of mergers and of allegedly anticompetitive conduct. The seminar will cover concepts like the SSNIP-test, diversion ratios and UPP indices in merger cases. In abuse of dominance cases finding the correct counterfactual and carrying out an “as efficient competitor”-test will often be required. With the help of experienced practitioners from OECD countries we will try to make these economic methods accessible to the participants. We will talk about data-, time- and resource-requirements, minimum and best practice standards for economic evidence and about the participants’ experiences in this field. The “translation” of economic results for lawyers and judges will be an important topic as well. Practical exercises and examples will enable the participants to apply the theory and to develop a better understanding.