Education lags behind other scientific disciplines in its effective use of data displays. An example is provided in which the reorganization of data from two bar graphs into one table highlights the obvious and subtle results. To address the need for effective data display, the companion article, "Understanding Graphs and Tables," was…

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)