Introduction Diversification Model Query Processing Evaluation Related Work Conclusions The Tantalizing New Prospect of Index-Based Diversified Retrieval George Tsatsanifos supervised by Timos Sellis gtsat@dblab.ece.ntua.gr SIGMOD’13 PhD Symposium New York, NY, USA, June 23, 2013 1 / 42 The Tantalizing New Prospect of Index-Based Diversified Retrieval