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.