The "Yearbook of Morphology 1999" is a significant academic book that focuses on diachronic morphology and provides deep insights into the development of complex morphological systems over time. This edition of the renowned series, which has been published since 1988, includes contributions from esteemed specialists addressing central themes of current theoretical debates. The articles illuminate, among other things, the interactions between morphology and phonology, the relationship between inflection and word formation, as well as the formal modeling of inflectional systems. A notable feature of this edition is an article on morphology in sign language, an innovative and exciting research field within linguistics. The topics discussed are supported by evidence from a variety of languages, including Germanic, Romance, and Slavic languages. This book is aimed at theoretical, descriptive, and historical linguists, morphologists, phonologists, and psycholinguists.