This book is a revised version of my Ph.D. dissertation that was
submitted to the Massachusetts Institute of Technology in 1983. Although
much of the analysis and argumentation of the dissertation has survived
rewriting, the organization has been considerably changed. To Paul
Kiparsky and Morris Halle, lowe a major debt. Not only has it been a
great privilege to work on phonology with both of them, but it is hard
to imagine what this piece of research would have looked like without
them. (They, of course, may well imagine a number of appropriate ways in
which the work could be different had I not been involved .... ) In
addition, special thanks are due to Ken Hale, the third member of my
thesis committee. Our discussions of a variety of topics (including
tone) helped me to keep a broader outlook on language than might have
otherwise been the result of concentrating on a thesis topic.