"1914-1918-online. International Encyclopedia of the First World War” is an English-language virtual reference work on the First World War. The multi-perspective, open-access knowledge base is the result of an international collaborative project involving more than 1,000 authors, editors, and partners from over fifty countries. More than 1,500 articles will be gradually published. Innovative navigation schemes based on Semantic Media Wiki technology provide nonlinear access to the encyclopedia’s content.