Instead, user interfaces which organize and group retrieval results have been shown to be helpful for and preferred by users over the straight results-list model when engaged in exploratory tasks (Yee et al., 2003;Pratt et al., 1999;Kaki, 2005).
a representation known as hierarchical faceted metadata is gaining great traction within the information architecture and enterprise search communities (Yee et al., 2003;Weinberger, 2005).