The next International UDC Seminar entitled “Classification & Visualization: Interfaces to Knowledge” will take place in the Koninklijke Bibliotheek, The Hague, 24-25 October 2013. The conference will explore the cutting edge in the visualization of knowledge across various fields of application, and their potential impact on developments in the more main stream bibliographic and documentary classifications. The call for papers is open; more details can be found on the UDC Seminar 2013 website.