The papers in this volume were presented at TMRA 2007, the International Conference on Topic Maps Research and Applications, held October 11-12, 2007, in Leipzig, Germany. TMRA 2007 was the third conference in an annual series of international conferences dedicated to Topic Maps in science and industry. The motto of TMRA 2007 was "Scaling Topic Maps." Taken literally the motto implies developing Topic Maps approaches that scale to large data and user volumes. This is a very real and useful research problem which is addressed by many of the contributions to the conference. But there is an even broader interpretation of the motto: wide adoption of Topic Maps in academia and industry. This is an equally important problem, and one that the TMRA conference series exists to help solve. And there is a more fanciful view on the motto. To "scale" can also mean to climb, so for the attendees the conference provided a way to "scale the mountain of Topic Maps." In all these ways TMRA 2007 helped to scale Topic Maps.

This book constitutes the thoroughly refereed post-conference proceedings of the Third International Conference on Topic Map Research and Applications, TMRA 2007, held in Leipzig, Germany in October 2007.

The 16 revised full papers and 4 revised short papers presented together with 1 invited paper and 1 keynote lecture were carfully reviewed and selected from 44 submissions. The papers are organized in topical sections on applied topic maps in industry and administration, visualisation and representation of topic maps, collaborative applications, standards related research, information integration with topic maps, social software with topic maps, topic maps engines, topic maps and dublin core, information management with topic maps, as well as open space and poster sessions.