This volume presents the studies of the East German philosopher Wolfgang Harich on logic, epistemology, and the relationship between logic and dialectic. It includes early works written by Harich as a student at the Berliner Universität; notes, lectures, articles, and essays that Harich wrote in the early DDR; and studies written by Harich after his imprisonment. Harich's studies in this volume are introduced by a selection from an extensive essay by the author on the logic debate in East German philosophy.