This is a series of brief surveys inteded for readers new to the formal study of language. Each book contains four parts: SURVEY An up-todate overview of the area concerned, READINGS Shor reading with study questions, REFERENCES , A slection of annotated references, GLOSSARY Explanations of terms, cross-referenced to the survey. This structure is designed to allow different groups of readers to focus on different parts of the book according to their interests and needs.