The research reported here was designed to measure the abilities of school-age children to form and generalize "visual concepts" on the basis of their observation of prepared sets of art reproductions. The art reproduction sets displayed similarities based upon various visual attributes. Discrimination of the attributes common to any given set was taken as evidence of concept formation. Selection of similar reproductions in additional displays was taken as evidence of concept generalization. Additionally, tape-recorded discussions of the test administrations were analyzed. These discussions yielded additional evidence of successful test performance (on a verbal dimension) and were useful in describing the character of children's abilities to discuss the visual attributes of art reproductions. Evidence gathered indicates that students at all grades (except, possibly, kindergarten) are able to form visual concepts from their observation of selected sets of art reproductions. Subjects also successfully described their classification of observed visual similarities when discussing the items. Students at all grade levels are also able to generalize visual concepts to previously unencountered examples. Reliability indices, computed for both types of displays, were below minimum standards for tests used to evaluate individual performance. The obtained reliabilities were attributed to interactions of low item intercorrelations, test length, and the lack of experience among subjects with the tasks tested. (Author/CK)