ABSTRACT
All psychologists know that the analysis of argumentation is not only important but also necessary. In fact, all psychologists constantly analyse the foundations and validity of argumentation. It is impossible to invent a single experiment, concept or theory without implicit foundational analysis. Hence, foundational analysis has always been a part of psychology. It has been practised by Plato and Freud as well as by modern experimental psychologists. However, this part of psychological research has never been thematized and included in the procedures of psychological research.
