The articles in this edited volume represent a range of approaches to studying the role of verbal aspect in grammatical variation. Issues addressed include: defining the variable context; operationalizing aspectual distinctions as factors conditioning linguistic variation; and the appropriate number of aspectual distinctions and levels. Apart from bringing to light various methodological and analytical issues, this volume gathers together a unique collection of original research, based on spoken- and written-language corpora, of an array of languages and linguistic varieties: African American Vernacular English, Caribbean English and English-based creole, Indian English, Newfoundland English, Canadian French, Brazilian Portuguese, Ecuadorian Spanish, Mexican Spanish, and Peninsular Spanish. This volume should not only benefit research on grammatical variation but also be of interest more generally to the study of verbal aspect.