Monitoring the Future (MTF) Series (ICPSR)Each year, large, distinct, nationally representative samples of 8th-, 10th-, and 12th-grade students in the United States are asked to respond to drug use and demographic questions, as well as to additional questions on a variety of subjects, including attitudes toward religion, parental influences, changing roles of women, educational aspirations, self-esteem, exposure to sex and drug education, and violence and crime - both in and out of school.