Proceedings of the 4th Italian Information Retrieval Workshop (IIR 2013)

The purpose of the Italian Information Retrieval (IIR) workshop series is to provide a forum for stimulating and disseminating research in information retrieval, where Italian researchers (especially young ones) and researchers affiliated with Italian institutions can network and discuss their research results in an informal way. IIR 2013 took place in Pisa, Italy, at the National Council of Research campus on January 16-17, 2013, following the first three successful editions in Padua (2010), Milan (2011) and Bari (2012).