Ludwig von Mises (1881-1973) set forth the principles of praxeology most systematically in his magnum opus, entitled Human Action (New Haven: Yale University Press, 1949). Its fourth edition is available online at www.mises.org/humanaction.asp. Although this treatise offers many brilliant insights and is treasured by serious scholars, it cannot be recommended unreservedly to the general reader, who may have difficulty fathoming its Teutonic prose and esoteric philosophical digressions. Mises, whose epistemological viewpoint is non-Objectivist, adopts a much narrower perspective than the one presented in this course, analyzing only the implications of the pursuit of subjective value, while overlooking the ethical ends and objective values that are implicit in human action. Within this limited scope, however, the concepts and principles that he develops are extremely useful. The interpretation of his ideas offered here, of course, is that of the present author.