Data warehousing has been a central topic in many industries for several years. However, the initial enthusiasm masked the fact that secure methods and procedural models for practical implementation were lacking. This book contributes to bridging the gap between aspiration and reality. The first part provides an overview of current results in the field of data warehousing, focusing on methodological and business aspects. It includes contributions on cost-effectiveness analysis, the organizational embedding of data warehousing, data quality management, integrated metadata management, and data protection issues, as well as a contribution on potential future development directions of data warehousing. In the second part, project managers of extensive data warehousing projects share their experiences.