11. User image needs and retrieval needs: Browsing can be done quickly Browsing is time consuming Requires browsing results Does not require browsing results One image is sufficient in satisfying a request In order to satisfy a request one or more image is required Biographical attributes are important for relevance assessment Biographical attributes are not likely to play a role Ofness is likely to be different from aboutness Ofness often equals aboutness Two different images may satisfy the same need Images must include the same subject headings to satisfy the same need Color, shape and texture are not important in retrieving an image Color, shape, and texture are important information in retrieving images It may be difficult to find text or subject heading to retrieve an image Images can be retrieved using text, and subject headings Users may find explaining the relevance of an image difficult It is possible for a user to explain why an image is relevant Relevance criteria are latent, and are invoked when viewing images Relevance criteria are specifications of which the user is aware User will recognize relevance criteria “when they see it” Relevance criteria can be determined ahead of time Images are objects Images provide information OBJECT POLE DATA POLE