Growth, mergers, restructuring, innovation - all these important topics of today's companies cannot be implemented without a systematic approach to IT management. This book does not point out unrealistic "one size fits all" solutions but offers systems to solve a broad range of IT problems and challenges. It also presents best practice cases for successfully implemented solutions - mostly in big companies as they ask for specific IT management. Value can be generated by using standard as well as individual software. The third edition maintains the core features but includes new results and a special focus on Green IT -- Green Business.