TY - CONF AU - N Belkin AU - S Dumais AU - Jean Scholtz AU - R Wilkinson C2 - CHI 2004 Extended Abstracts, , LA DA - 2004-04-01 00:04:00 LA - en PB - CHI 2004 Extended Abstracts, , LA PY - 2004 TI - Evaluating Interactive Information Retrieval Systems: Opportunities and Challenges ER -