SIGIR'04 Keynote Posters Tutorials Session I: Opening session Session IIa: Test collections Session IIb: Formal models - 1 Session IIIa: XML retrieval Session IIIb: Dimensionality reduction Session IVa: Formal models - 2 Session IVb: Cross-language information retrieval Session Va: Language models Session Vb: Clustering Session VIa: Text Classification Session VIb: Disambiguation Session VIIa: Recognising and using named entities Session VIIb: Efficiency and scaling Session VIIIa: Content-based filtering & collaborative filtering Session VIIIb: Image retrieval, users and usability Session IXa: Machine learning for IR Session IXb: Natural Language Processing Session X: Web structure ©2005 Association for Computing Machinery