This book focuses on a number of approaches of assessment associated with information systems (IS) effectiveness. Fundamental guidelines for research in this area have been derived, and a novel model of IS effectiveness has been proposed. A process based assessment method (PB-ISAM) based on the proposed effectiveness model has been elaborated. The new model and the new assessment method have been evaluated via three case studies in three different contexts. Specific implications have been drawn concerning the relationships between processes and the information system assessed. The three case...