Faceted Web Search?
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Researchers from Microsoft say it’s very challenging. Google is trying, but there’s a long way to go. And Eric Iverson just wrote me to describe his own preliminary efforts to build faceted search on top of Yahoo! BOSS.
I believe there’s a clearly established business case for faceted search inside the enterprise, for site search (especially for retail and media / publishing sites), even for vertical search on the open web. In all of these cases, relevance-ranked results are insufficient to meet a large subset of users’ more exploratory information needs, and HCIR approaches like faceted search are an easy sell.
But ...