Book excerpt: Originally published in 1978. This book provides and explains a framework for understanding and describing variations of style of language in relation to the social context in which it is used. Constant features of language users, such as their temporal, geographical. and social origins, their range of intelligibility, and their individualities, are related to concepts of dialects, but dialects are not the only kind of language variety. There are features of language situations that yield others; the medium used, the roles of the users and their relationships, as well as recurring situations and cultural habits, all relate to the style employed. Variety in language can be seen in terms of the major functions of language, as 'content' as 'inter-action' and as 'texture'. Studying variety in language from sociological and linguistic aspects this book is also interesting for psycholinguistics and literary study.