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This chapter reviews published studies of the use of pictorial information. Examining image user studies surfaces several research questions often addressed by this body of work, as well as some frequently encountered problems. These questions and problems organize this survey of the literature. Image user studies were included in two valuable reviews of digital image research and development, published by Christie Stephenson and Corinne Jörgensen in 1999 (Jörgensen, 1999; Stephenson, 1999). This overview considers research since that time, focusing on assessment that was not targeted at a single system or service. While attempting to incorporate some interesting research from the information and educational technology communities, this discussion of image delivery as an aspect of digital library development limits coverage of those important literatures.