A test of graphicacy was developed, administered to third- through fifth-grade schoolchildren, and scored using the Rasch model. Third-grade children were much poorer at reading graphs than fourth- or fifth-grade children, but the differences between these latter two groups were modest. (Author/JKS)

Three historic examples demonstrate the vital role data displays (graphs and tables) have played in important discoveries. Levels of information that form the basis of a theory of display are described, and steps to improve the quality of tabular presentations in educational writing are outlined. (SLD)