'This is the most important argumentation theory in the world today. It is the only theory that incorporates a developed underlying philosophical perspective with a complete elaboration of a theory and a full account of its practical applications. It is the only theory that integrates insights from the complete range of fields in which argumentation is studied (among others: linguistics, philosophy of language, logic, communications, rhetoric) … It has had simply a huge influence on argumentation studies around the world.' J. Anthony Blair, University of Windsor