“The Handbook of Phonological Theory” offers a unique and detailed examination of phonology and the transformations that have taken place in the fifteen years since the publication of the first edition. Comprised almost entirely of material new to this edition, this Handbook consciously builds upon its previous edition, using it as a foundation to explore the current shape of the field and the questions that drive ongoing research. Written by an international team of phonologists, each of the 28 chapters investigates and assesses key issues in the field, including learnability, phonological interfaces, tone, and variation.