Presented at VlaPoLo7 Workshop (Brussels, Belgium)

Abstract. Problem solving in the sciences often forces us to rely on a pragmatic notion of truth. An adaptive logic interpreting scientific theories as pragmatically possible was already given in (Meheus, 2002). The logic presented in this paper refers to a complementary view on pragmatic truth: not with respect to theories but with respect to single statements, facts or data. Therefore we rely on Nicholas Reschers concept of presumptive truth and the connected cognitive action called (presumptive) taking presented in (Rescher, 2001), and present an adaptive logic modelling the local acceptance and rejection of a statement.