Presents the standard ontological commitment approach, together with a defense of the thesis of ontological relativity. This book provides, at the same time, a wide-ranging overview of the ground conceptual tools of ontology.

Scientific literature on particular themes in ontology is extremely abundant, but it is often very hard for freshmen or sophomores to find a red thread between the various proposals.
This text is an opinionated introduction, a preliminary text to research in ontology from the so called standard approach to ontological commitment, that is from the particular point of view that connects ontological questions to quantificational questions. It offers a survey of this viewpoint in ontology together with their possible applications through a broad array of examples and open problems and, at the same time, essential references to the classics of philosophy, so as to allow non-specialists to understand the terms and analysis procedures characterizing the discipline. Its result is a wide-ranging overview of the issued tackled by ontology, with a particular focus on the most relevant problems of contemporary debate (categorial taxonomies, nonexistent objects, case studies of ontological debates in specific fields of knowledge).