The philosophical thought of J. G. Fichte, particularly his later work, is at the very center of the paradigm shift under way in the field of German idealism. Crucial to this reassessment is Fichte's Wissenschaftslehre nova methodo of 1796 to 1799, the manuscript at the heart of this essay colleciton and an articulation of the philosopher's Wissenschaftslehre, or overall system of philosophy, which he discussed in lectures at the University of Jena. Coherent, comprehensive, and edited by two of the foremost Fichte scholars in the world, the essays provide a much needed introduction to the major themes of the most important period of Fichte's philosophical thought—and thus to German idealism itself—and make a persuasive case for the originality and continuing significance of the later Jena Wissenschaftslehre.