On the Necessity of Term Dependence in a Query Space for Weighted Retrieval Peter BOLLMANN-SDORRA and Vijay V. RAGHAVAN Fachbereich Informatik, FR 6–9 Technische Universitat Berlin Franklin Strasse 28/29 10587 Berlin Germany Center for Advanced Computer Studies P.O. Box 44330 University of Southwestern Louisiana Lafayette, LA 70504–4330 ABSTRACT In recent years, in the context of the vector space model, the view, held by many researchers, that documents, queries, terms, etc. are all elements of a common space has been challenged (Bollmann-Sdorra and Raghavan, 1993). In particular, it was noted that term independence has to be investigated in the context of user preferences and it was shown, through counter examples, that term independence can hold in the document space, but not