Risk Management in Blood Transfusion: The Virtue of Reality James J von Weizsacker for his paper Unterrichts und Medizinal Augelegenheiten von Weizsacker for his paper Reservoirs generally consist of sandstones or carbonates exhibiting heterogeneities caused by a wide range of factors A great number of prestigious institutes all over the world involved in the development of transfusion medicine have linked to Groningen and we are proud of that The organisation of this symposium aims at scientific networking by discussing in an international forum the most important themes of current interest in relation to the state of the art in transfusion medicine