The Clinical Trials constitute the scientifically established and acceptable way of evaluation of therapeutic measures. The seminar that we have the pleasure to organise in Athens and Thessaloniki presents a complete education in the frame, the planning, the collection and analysis of data, the evaluation and the presentation of Clinical Trials, as well as an extensive discussion of concrete examples from various specialities. It is addressed to young clinical doctors which are usually called to apply the relative processes, but are also most often responsible for the the organisation and the evaluation of Clinical Trials.