  This chapter presents probability logic as a rationality framework for human
reasoning under uncertainty. Selected formal-normative aspects of probability
logic are discussed in the light of experimental evidence. Specifically,
probability logic is characterized as a generalization of bivalent
truth-functional propositional logic (short "logic"), as being connexive, and
as being nonmonotonic. The chapter discusses selected argument forms and
associated uncertainty propagation rules. Throughout the chapter, the
descriptive validity of probability logic is compared to logic, which was used
as the gold standard of reference for assessing the rationality of human
reasoning in the 20th century.
