Koasati a Muskogean language is spoken by about 200 people in Elton Louisiana and by a smaller number near Livingston Texas. This volume contains a brief sociolinguistic note a phonological description and a grammar outline. Then in the remaining two chapters the salient features of switch reference in the language are described and it is shown that this feature is not just a syntactic phenomenon but also a pervasive system that interacts with high-level discourse.