To complement this background information on technology issues the authors present the most relevant conservation projects internationally, such as the Dublin Core Metadata Initiative, and experiences of a sample project that is run by Cornell University Library and the National Library of the Netherlands. A rated survey list of available systems and tools complete the book. With a broad view, the authors address librarians who preserve our digital heritage, a computer scientist who developed the data access technology, and information managers engaged with social requirements and methodology of long-term information access.