This books presents the most comprehensive description and analysis to date of Hebrew morphology, with an emphasis on the verbal templates. Its aim is to develop a theory of argument structure alternations which is anchored in the syntax but has systematic interfaces with the phonology and the semantics. Concretely, the monograph argues for a specific formal system centered around possible values of the head Voice. The formal assumptions are as similar as possible to those made in work on non-Semitic languages. The first part of the book (four chapters) is devoted to Hebrew; the second part (two chapters) compares the current theory with other approaches to Voice and argument structure in the recent literature.