User Engagement (UE) is a complex concept to investigate. The purpose of this book is not to constrain UE to one perspective, but to offer a well-rounded appreciation for UE across various domains and disciplines. The text begins with two foundational chapters that describe theoretical and methodological approaches to user engagement; the remaining contributions examine UE from different disciplinary perspectives and across a range of computer-mediated environments, including social and communications media, online search, eLearning, games, and eHealth. The book concludes by bringing...