Truth and the truth-maker principle in 1921 / Kevin Mulligan -- Truth-makers / Kevin Mulligan, Peter Simons and Barry Smith -- Truth-makers, entailment and necessity / Greg Restall -- Postscript to "Truth-makers, entailment and necessity" / Greg Restall -- Truth-making and difference-making / David Lewis -- The general theory of truth-making / D.M. Armstrong -- Truth-making and correspondence / Marian David -- Facts and relations : the matter of ontology and of truth-making / Herbert Hochberg -- Being and truth / Paul Horwich -- An essentialist approach to truth-making / E.J. Lowe -- Are there irreducibly relational facts? / Josh Parsons -- Why truth-makers / Gonzalo Rodriguez-Pereyra -- Postscript to "Why truth-makers" / Gonzalo Rodriguez-Pereyra.