The evaluation of IT and its business value have been the subjects of many academic and business discussions, as business managers, management consultants and researchers regularly question whether and how the contribution of IT to business performance can be evaluated effectively. Investments in IT are growing and business managers worry about the fact that the benefits of IT investment might not be as high as expected. This phenomenon is often called the IT investment paradox or the IT black hole: large sums are invested in IT that seem to be swallowed by a large black hole without rendering many returns. This text discusses these issues among others, through its presentation of contemporary research in the field of IS evaluation. It is an area of study that touches upon a variety of types of businesses ad organization - essentially all those who involve IT in their business practices.