We would like to express our gratitude to a number of people who have helped to bring this Handbook to completion.

First and foremost, we thank our contributing authors who responded to our many requests and suggestions with understanding and grace. Without their knowledge and passion for this subject and their willingness to commit it to paper, this work would not have been possible.

We thank Paul de Lacy, editor of The Cambridge Handbook of Phonology, for his support and advice. We are grateful that he went through this process first and was then so helpful in ushering us through it.

Our many thanks to Andrew Winnard at Cambridge University Press for helping us to develop this Handbook and for his patience and good humor throughout this process, and to Sarah Green for her editorial help and her rapid responses.

To Aaron Roggia, who compiled and hand-checked every single reference in this Handbook for consistency and accuracy, we owe an inestimable debt. If any errors remain, they are entirely ours.

Finally, we express our heartfelt thanks to the students of our Contact Linguistics seminar, whose continued interest in issues of bilingualism and language contact inspired us to produce this volume: Hilary Barnes, Joshua Brown, Amanda Dalola, Verónica González, Ana de Prada Pérez, Aaron Roggia, and Eva María Suárez Budenbender.