Abdelkrim BOURAMOUL*,**, Mohamed-Khireddine KHOLLADI**, Bich-Liên DOAN***
*Department of Computer Science, Guelma University -**MISC laboratory, Constantine University. ***SUPÉLEC, Department of Computer Science. 3 Rue Joliot-Curie, 91192 Gif sur yvette, France

Abstract
Searching for information on the Web engages the user in a process of interrogating and querying the chosen search engine. However, the initial user's query rarely returns a result that satisfies his need for information. The reformulation of the initial query is to modify its terms in order to return a result that better meets the user’s needs. In this paper we propose a contextual query reformulation system that takes user’s context into consideration via his profile, thus we identify the parts of the context to be used to assist in the contextual reformulation and we show how the user’s profiles are used to catch the context, we present also the proposed architecture and the developed prototype.

Keywords: Information Retrieval, query reformulation, dynamic context, static context, user Profiles