This book constitutes the proceedings of the 34th European Conference on IR Research ECIR 2012
held in Barcelona Spain in April 2012. The 37 full papers 28 poster papers and 7
demonstrations presented in this volume were carefully reviewed and selected from 167
submissions. The contributions are organized in sections named: query representation blogs and
online-community search semi-structured retrieval evaluation applications retrieval models
image and video retrieval text and content classification categorisation clustering systems
efficiency industry track and posters.
