The essays collected in this volume concern the general question of truthmaking. Most of them also bear upon the metaphysical nature of truthmakers (moments, tropes, property-instances, Aristotelian substances, states of affairs, meanings or essences? ). Taking as their starting point a famous seminal paper by K. Mulligan, P. Simons and B. Smith, as well as D. Armstrong’s outstanding contribution to the subject, they offer a fresh assay of the main concepts involved, in order to assess the explanatory value of truthmakers and truthmaker necessitarianism, and explore such delicate issues as contingent truth, bare possibility, tensed propositions, the ontological irreducibility of relations, the subsistence of facts and the epistemic role of negative truths. The collection as a whole provides a comprehensive and thought-provoking survey of the current debate about truthmaking theory and deserves to be read carefully by anyone interested in the relationship between language, thought and reality. With contributions from David ARMSTRONG, Stefano CAPUTO, François CLEMENTZ, Pascal ENGEL, Herbert HOCHBERG, Philipp KELLER, Jonathan LOWE, Jean-Maurice MONNOYER, Kevin MULLIGAN, Stephen MUMFORD, Frederic NEF, Peter SIMONS, Barry SMITH, Jonathan SIMON