The notion of outsourcing – making arrangements with an external entity for the provision of goods or services to supplement or replace internal efforts – has been around for centuries. The outsourcing of information systems (IS) is, however, a much newer concept, but one which has been growing dramatically. This book attempts to synthesize what is known about IS outsourcing by dividing the subject in six interrelated parts: (1) determinants of outsourcing, (2) relationship issues, (3) user experiences, (4) vendor and individual perspectives, (5) application service providing, and (6) offshoring. The book should be of interest to all academics and students in the field of Information Systems as well as corporate executives and professionals who seek a more profound analysis and understanding of the underlying factors and mechanisms of outsourcing.