A multifaceted evaluation study was conducted of the 2,000-square-foot exhibit "Darkened Waters: Profile of an Oil Spill" between September 14 and October 12, 1991, at the Oakland Museum, Natural Sciences Department. "Darkened Waters" is the second generation of an exhibit originally conceived and built by the Pratt Museum in Homer, Alaska, to provide information and a forum for the environmental impact of the 1989 Exxon Valdez oil spill. The exhibit will travel to the Smithsonian Institution in December 1991, and will be available to other institutions through the Association of Science