To illuminate information technology outsourcing relationship practice, the authors present five longitudinal case studies: Xerox, ESSO, British Aerospace, British Petroleum, and the Inland Revenue.

The post-contract relationship in IT outsourcing often determines the success or failure of an outsourcing venture. Using five longitudinal case studies, the authors address the various factors involved in outsourcing relationships and present pointers to assist managers and practitioners achieve the 'relationship advantage' in outsourcing.