I. Combat on Two Fronts -- A. Significance of Two Condemnations -- B. Dialectical Materialism faces its Critics -- C. Stalin and De-Stalinisation -- II. Categories of Diamat and Categories of Science -- A. The Need for Cooperation -- B. The Nature of the Cooperation -- C. Critical Remarks -- III. Definition of the Notion of Category -- A. Precursors -- B. Abstraction of the Categories -- C. The โ{128}{152}Theory of Reflectionโ{128}{153} and Empiricism -- IV. The Dialectic of the Categories -- A. Dialectification of the Categories -- B. Refusal of a Dialectification of the Categories -- C. Identity of Logic, Dialectic and Epistemology? -- D. System and Method in Hegel -- E. Objective Truth: Absolute and Relative -- V. The Category of Matter: Basis of Ontology -- A. Vulgar Materialism and Dialectical Materialism -- B. The Attributes of Matter -- C. The Materialism of Practice and the Materialism of Matter -- VI. Dialectical Contradiction -- A. Matter and Movement: Evolution -- B. Dialectical Contradiction -- C. Transition from Quantity to Quality -- D. The Law of Negation of Negation -- VII. Causality-Finality -- A. The Category of Causality -- B. The Category of Finality -- Conclusion -- Index of Names