Frontmatter -- ACKNOWLEDGMENTS -- TABLE OF CONTENTS -- 1. INTRODUCTION -- 2. THE MATHEMATICAL THEORY OF LANGUAGES -- 3. ARGUMENTS AGAINST THE ADEQUACY OF FINITE STATE GRAMMAR -- 4. ARGUMENTS AGAINST THE ADEQUACY OF CONTEXT-FREE GRAMMAR -- 5. PERFORMANCE MODELS -- 6. ARGUMENTS AGAINST THE ADEQUACY OF BEHAVIORIST PERFORMANCE MODELS -- 7. CONCLUSION -- BIBLIOGRAPHY -- INDEX