Like every business function, IT must also demonstrate its financial value contribution today. To illustrate the cost-effectiveness of IT activities, it is necessary to bridge the gap between the principles and mechanisms of financial management on one hand and the drivers and characteristics of information technology on the other. This book accomplishes this bridge by imparting IT-oriented financial knowledge and showing how the demand for an economic positioning of IT is put into practice. It presents comprehensible solutions and approaches for a wide range of practical tasks. In particular, it describes how to conduct cost-effectiveness analyses for IT projects or IT investments and how to provide evidence of cost-effectiveness. The new edition has been revised and expanded to include the topic of opportunity costs.