The major purpose of the present study was to determine if reader-gene
rated illustrations are as effective as experimenter-provided illustra
tions in providing students with the ability to understand scientific
explanations. In addition, the authors were interested in replicating
work by R. E. Mayer and colleagues (e.g., R. E. Mayer & R. B. Anderson
, 1991; R. E. Mayer & J. K. Gallini, 1990) using different texts. The
authors found that students with text and illustrations and students w
ho generated their own illustrations performed better on a problem-sol
ving test than students with text only and that there were no signific
ant differences in performance between the former 2 groups.