Query Formulation, cont.

• To help users with the query formulation problem, relevance feedback may be provided

• The authors argue that relevance feedback is even more useful in the domain of images since users may more easily tell “at a glance” is an image is relevant to their information needs

• Implicit feedback is preferable to explicit feedback in this system since explicit may require the user to gauge the degree to which an image is relevant, which may not be possible given the user’s relative ignorance of the system’s contents