ABSTRACT
Th e user interface typically consists of a query formulation part and a result presentation part. Th e relevance feedback mechanism provides additional advantages for a retrieval system. Th e most signifi cant advantages are as follows:
It acts as a conceptual screen between the users and the query formulation mechanism, allowing the user to formulate eff ective queries without intimate or prior knowledge of the search process or the archive structure. It structures the search process by breaking the search operation into sequences of iterative steps designed to gradually approach the targeted relevant documents. It provides a controlled environment for query formulation and subsequent adaptation by allowing the user to emphasize relevant (and/or irrelevant) items and their features as required by the particular information needs of the users.
