This book delineates itself critically from other attempts to interpret Hegel’s system by presenting the most decisive attempt to interpret this philosophy as an ‘ontological option’ from a ‘non-metaphysical’ viewpoint. Hegel’s science of logic is seen as a dialectical development of those categories of thinking which are at the same time categories of being. The author understands Hegelian logic as a theory which claims to prove the capacity for truth of thinking as long as it lays claim to a knowledge of reality.In addition, Hartmann’s posthumous work offers a constitutive and critical commentary on one of the most difficult works of philosophy, which has still not been completely understood.