This study focuses on Web- based Identity Management Systems (IdMS), a new and emerging field where technology and business processes are integrated for the creation of identity -centric approaches to the management of users, their attributes, authentication factors and security privileges across the Internet and within an organisation. Understanding factors that affect user adoption of information technology is of interest to researchers in a diversity of fields. Although previous studies have addressed an extensive range of factors related to user adoption of information technology applications and products, there is no research examining the adoption of IdMS . In addition, no studies have investigated the conceptualisation and measurement of adoption factors in the IdMS context. The main objective of this study is to fill this clear gap by aiming to explore and understand the important factors influencing the user adoption of IdMS.