This volume surveys a variety of verb valency change phenomena among diverse languages and from diverse theoretical viewpoints. It offers typological studies comparing languages in topics like applicative polysemy, complex predicate formation and locative alternation, but also works describing the different valency-changing operations in specific languages including West Circassian, Huasteca Nahuatl, Tlachichilco Tepehua and Seri, and works dealing with specific valency change constructions, such as tla- constructions in Nahuatl, resultatives in Yaqui, antipassives in Mocovi, and labile verbs in Arabic. This book aims to put this variety of backdrops in perspective and to clarify the notion and mechanisms of verb valency change. Both scholars and expert readers will get in these works a better understanding of the different verb valency changing operations and of the typological aspects involved in this phenomenon, together with a better grasp of how argument realization and verb morphology are connected in some languages.