This resource is intended to support educators at all levels of the public school system in building data systems that identify probable high school dropouts before they leave school.  The guide discusses the factors that help predict the probability that individual students will eventually drop out of high school prior to graduating and includes step-by-step instructions for building an early warning system.   Also see the Early Warning System Tool on the same page.  (The National High School Center is a project of American Institutes for Research in Washington DC, with funding from the Office of Special Education Programs, U.S. Department of Education.)