Quantification is a topic which brings together linguistics, logic, and philosophy. Quantifiers are the essential tools with which, in language or logic, we refer to quantity of things or amount of stuff. In English they include such expressions as 'no,' 'some,' 'all,' 'both,' and 'many.' Peters and Westerståhl present the definitive interdisciplinary exploration of how they work - their syntax, semantics, and inferential role.