In two experiments, high school students read and listened to either a signaled or nonsignaled expository passage. Signals consisted of preview sentences, underlined headings, and logical connective phrases. Results indicated a pattern in which the signaled groups performed better on recall of conceptual information and on generating high quality…

This review of 20 studies examines 3 predictions concerning the effects of conceptual models on students' understanding of scientific prose: (1) that models improve recall of conceptual information; (2) that they decrease verbatim retention; and (3) that they increase creative solutions on transfer problems. (SLD)