This book is a compilation of chapters written by leading researchers from all over the world. Those researchers' common characteristic is that they have investigated issues at the intersection of the elds of information systems (IS) and evoluti- ary psychology (EP). The main goal of this book is to serve as a reference for IS research building on EP concepts and theories (in short, IS-EP research). The book is organized in three main parts: Part I focuses on EP concepts and theories that can be used as a basis for IS-EP research; Part II provides several exemplars of IS-EP research in practice; and Part III summarizes emerging issues and debate that can inform IS-EP research, including debate regarding philosophical foundations and credibility of related ndings. IS-EP research is generally concerned with the use of concepts and theories from EP in the study of IS, particularly regarding the impact of modern information and communication technologies on the behavior of individuals, groups, and organi- tions. From a practitioners' perspective, the most immediate consumers of IS-EP research are those who develop and use IS, of which a large contingent are in bu- nesses that employ IS to support marketing, order-taking, production, and delivery of goods and services. In this context, IS-EP ndings may be particularly useful due to the present need to design web-based interfaces that will be used by in- viduals from different cultures, and often different countries, and whose common denominator is their human nature.