Multilingualism is an international fact of life and increasing in the United States. Multilingual families are exceedingly diverse, and policies relevant to them should take this into account. The quantity and quality of a child's exposure to responsive conversation spoken by fluent adults predicts both monolingual and multilingual language and…

The language competence of adults in Great Britain was examined in a national study involving interviews between April 28 and May 9, 1999, with a representative sample of 3,967 adults over the age of 16 years. Of those surveyed, 58% spoke only their mother tongue, 29% spoke one additional language, and 10% spoke two additional languages. Fifteen…