Graphs don't always show what the graphers say they do. The most notorious recent example of a misleading graph is the one produced by the U.S. Department of Education that plots National Assessment of Educational Progress (NAEP) reading scores against total federal spending on education. This graph was taken apart by Howard Wainer and Daniel Koretz in the Fall 2003 issue of Chance. And in March 2004 the author dealt with it in this column. This article discusses what makes a graph bad.