CLEF 2007. Editorial

These Working Notes contain descriptions of the experiments conducted within CLEF 2007 organised by the Cross-Language evaluation Forum. The final papers - revised and extended as a result of the discussions at the Workshop - together with a comparative analysis of the results will appear in the CLEF 2007 Proceedings, to be published by Springer in their Lecture Notes for Computer Science series. CLEF organises a series of evaluation tracks designed to test different aspects of mono- and cross-language information retrieval system development. The intention is to encourage systems to move from monolingual text retrieval to the implementation of a full multilingual multimedia search service.