Signed language users can draw on a range of articulators when expressing linguistic messages, including the hands, torso, eye gaze, and mouth. Sometimes these articulators work in tandem to produce one lexical item while in other instances they operate to convey different types of information simultaneously. Over the past fifteen years, there has been a growing interest in the issue of simultaneity in signed languages. This book offers a comprehensive treatment of this topic, presenting a collection of papers dealing with different aspects of simultaneity in a range of related and unrelated signed languages, in descriptive and cross-linguistic treatments which are set in different theoretical frameworks.