Preface. Part I: Models, Relevance and Impossibility. Negation: Two Points of View; A. Avron. A Comparative Study of Various Model-Theoretic Treatments of Negation: A History of Formal Negation; J.M. Dunn.. Negation in Relevant Logics (How I Stopped Worrying and Learned to Love the Routley Star); G. Restall. Negation in the Light of Modal Logic; K. Dosen. Part II: Paraconsistency, Partiality and Logic Programming. Negation and Contradiction; D. Gabbay, A. Hunter. What not? A Defence of Dialetheic Theory of Negation; G. Priest. Partial Logics with Two Kinds of Negation as a Foundation for Knowledge-Based Reasoning; H. Herre, et al. From Here to There: Stable Negation in Logic Programming; D. Pearce. Part III: Absurdity, Falsity and Refutability. Antirealism and Falsity; M. Hand. Negation, Absurdity and Contrariety; N. Tennant. Negation as Falsity: A Reply to Tennant; H. Wansing. Part IV: Negations, Natural Language and The Liar. Models for Non-Boolean Negations in Natural Languages Based on Aspect Analysis; M. La Palme Reyes, et al. Negation, Denial and Language Change in Philosophical Logic; J. Tappenden. What is That Item Designated Negation? R. Sylvan. Index.