The United States Monitoring the Future Survey, 8th and 10th Grade Students 2013 is part of the Monitoring the Future Study, a nationally representative annual study of students enrolled in public and private high schools in the United States. Begun in 1975 as a survey of 12th grade students, 8th and 10th grade surveys were added to the series in 1991. Monitoring the Future (MTF) surveys provide information on the attitudes and behaviors of students on the use and abuse of substances such as alcohol, tobacco, and illicit and prescription drugs. The MTF study is designed so that changes in attitudes and behaviors can be observed across time. Participants in the MTF 2013 (8th/10th Grade) survey include 15,233 8th grade students from 116 public schools and 27 private schools, and 13,262 10th grade students from 103 public schools and 17 private schools.