Faceted Classification Today: Theory, Technology and End User are proceedings of the sixth International UDC Seminars that took place on 14-15 September in London (United Kingdom). The Seminars are devoted to advances in documentary classification research and their application in a networked environment. Faceted Classification Today focuses on faceted analytical theory as a method for (re)constructing modern analytico-synthetic classifications and explores potential fields of application for facet analysis in information organization. The proceedings contain thirteen full papers and four short poster papers by the most eminent authors in the field of Knowledge organization including Richard Smiraglia, Vanda Broughton, Dagobert Soergel, Claudio Gnoli, Re-becca Green, Martin Fricke, Rick Szostak, etc. The book provides an indepth analysis of theoretical issues of facet analysis and pointing toward the tension between the theoretical framework and its application in information retrieval. It is an up-to-date source on the topic facet analysis aimed at information professionals, researchers, lecturers in library and information science and computer science as well as controlled vocabulary developers and designers.