Common Sense and Logic in Jan Smedslund's 'Psycho-logic'. This paper is about the efforts the norwegian psychologist Jan Smedslund made in analyzing and checking philosophically his theory called 'Psycho-logic'. I am going to reconstruct and discuss the debates between Smedslund and several critics, which have been going on since about 1978, mainly in the "Scandinavian Journal of Psychology". A result will be that the kind of modal logics Smedslund uses - a type with realistic semantics and epistemology - is not (...) the proper one for the analysis of 'Psycho-logic'. (shrink)