An introductory essay by the editors offers an overview of the volume and introduces students to the major debates that are contained within the main body of the text. The collection contains classic contemporary papers on topics such as Ontological Commitment and Methodology, Possible Worlds and Possibilia, Properties and Universals, Substances, Events, Tropes and Mathematical Objects. It also includes seven newly-commissioned state-of-the-art articles by Van Inwagen, Lycan, Bealer, Loux, Lombard, Macdonald and Field.