The papers in this volume investigate the semantics of aspect from both a theoretical and a crosslinguistic point of view, in a wide range of languages from a number of different language families. The papers are all informed by the belief that a thorough exposure to the expression of aspect crosslinguistically is crucial for progress in understanding how the semantics of aspect works and what the semantic basis of aspectual distinctions is. The languages discussed include Russian, English, Dutch, Hebrew, Mandarin, Japanese and Kalaallisut. The issues discussed in this volume include the centrality of measuring and counting in an understanding of telicity; the importance of the singular/plural distinction in the study of aspect; the importance of homogeneity as a property of event types; the flexibility of lexical classes; and the interaction between expressions of aspect and the particular morphosyntactic structure of a language.