This work attempts to provide an overview of linguistic diversity in South Asia and to place this diversity in a cultural context. The work tries to describe the current state of knowledge concerning socially conditioned language variation in the subcontinent. Each of five major language families contains numerous mutually intelligible and unintelligible dialects. Different dialects of a language may be required for written and spoken use and for different social groups. Bilingualism and multilingualism are common for communication between groups. Language choice is important for education, politics, radio and television. Chapter 2 of this book enumerates criteria used in the taxonomy of language forms, discussing a number of theories of dialect formation from the points of view of linguistic innovation and diffusion of linguistic change. Chapter 3 surveys literature on classification of South Asian languages. Chapter 4 considers South Asia as a distinct linguistic area and Chapter 5 evaluates literature on South Asian social dialects. Chapter 6 examines linguistic codes encompassing elements from more than one autonomous language. Chapter 7 considers the ways in which the lexicon of South Asian languages and dialects contain elements that structure themselves into concrete systems. (CHK)