These factsheets are concise summaries of key issues of concern to the DOI^® System user community. They are intended to be largely stand-alone summaries, focussing on important features of system technology, dealing with implementation issues rather than deep technical detail. An initial focus of the factsheets will be comparisons of the DOI System with other standards and technologies.

Further factsheets are currently in development. We welcome suggestions for any new topics.

• Key Facts on Digital Object Identifier System

• DOI^® System and the Handle System^®

• DOI^® System and Numbering Schemes

• DOI^® System and Data Dictionaries

• DOI^® System Applications

• DOI^® System and Internet Identifier Specifications

• Value Added by the DOI^® System

• Identifier Interoperability