Well over three million children, K-12, are estimated to have lost instructional "seat time" in 2009-2010 because they were suspended from school, often with no guarantee of adult supervision outside the school. That's about the number of children it would take to fill every seat in every major league baseball park and every NFL stadium in America, "combined". Besides the obvious loss of time in the classroom, suspensions matter because they are among the leading indicators of whether a child will drop out of school, and because out-of-school suspension increases a child's risk for future incarceration. Given these increased risks, what we don't know about the use of suspensions may be putting our children's futures (and our economy) in jeopardy. This executive summary presents the findings of a national report that is based on suspensions of students in K-12 in 2009-2010. This national report represents the first major effort to fill the knowledge gap around school discipline as it stands in thousands of districts in nearly every state. Based on data released in March 2012 by the U.S. Department of Education, the authors analyze the risk of out-of-school suspension for every racial/ethnic group, as well as for students with and without disabilities. [For the full report, "Opportunities Suspended: The Disparate Impact of Disciplinary Exclusion from School," see ED534178.]