In many languages, word formation is restricted by principles of prosody that organize speech sounds into larger units such as the syllable. Written by an international team of leading linguists in the field of prosodic morphology, this book examines a range of key issues in the interaction of word formation and prosody. It provides an explanation for nonconcatenative morphology that occurs in different forms (such as reduplication) in many languages, by an interaction of independent general principles of prosodic and morphological well-formedness.