Reasoning is the foremost human intellectual ability, an ability that underlies the characterization of humans as rational animals. Reasoning critically involves the drawing inferences; on the basis of a few beliefs or premises that are either accepted or function as working hypotheses, one draws some other beliefs, the conclusions of the inference, which differ from the premises. A primary aim of this course is to introduce the students to the basic kinds of reasoning. A second aim is to present the various forms of representations on which reasoning is based. A third aim, which draws from the discussion in the two previous aims, is to examine the ways in which the form of the representational medium interacts with reasoning abilities in a variety of contexts.