Kant claims to have established his table of categories or "pure concepts of the understanding" according to the "guiding thread" provided by logical forms of judgment. By drawing extensively on Kant's logical writings, Beatrice Longuenesse analyzes this controversial claim, and then follows the thread through its continuation in the transcendental deduction of the categories, the transcendental schemata, and the principles of pure understanding. The result is a systematic, persuasive new interpretation of the Critique of Pure Reason. Longuenesse shows that although Kant adopts his inventory of the forms of judgment from logic textbooks of his time, he is nevertheless original in selecting just those forms he holds to be indispensable to our ability to relate representations to objects. Kant gives formal representation to this relation between conceptual thought and its objects by introducing the term "x" into his analysis of logical forms to stand for the object that is "thought under" the concepts that are combined in judgment. This "x" plays no role in Kant's forms of logical inference, but instead plays a role in clarifying the relation between logical forms (forms of concept subordination) and combinations ("syntheses") of perceptual data, necessary for empirical cognition. Considering Kant's logical forms of judgment thus helps illuminate crucial aspects of the Transcendental Analytic as a whole, while revealing the systematic unity between Kant's theory of judgment in the first Critique and his analysis of "merely reflective" (aesthetic and teleological) judgments in the third Critique. Longuenesse opens new avenues for investigating the relation between logic, psychology, and metaphysics in Kantian and post-Kantian philosophy.