The 1971-72 Michigan Educational Assessment Program (MEAP) provided information on 22 measures of students and schools. While some of the data were gathered in routine Michigan Department of Education reports, mean socioeconomic status (SES) for each school and student performance data were gathered in a special endeavor during January 1972. The SES was estimated from information gathered in a questionnaire prepared by school principals. Students receiving regular classroom instruction in grades 4 and 7 were tested using a basic skills battery thereby providing student performance data. The battery consisted of four tests: Word Relationships, Reading, Mechanics of Written English, and Mathematics. For each of the four tests at each grade level, the raw score distribution was transformed into a standard score distribution with a mean of 50 and a standard deviation of 10. A majority of the achievement tests were somewhat difficult for students at both grade levels. However, the range of difficulty among items appears to be well represented. The tests possess acceptable to excellent ability to discriminate between good and poor students. (Author/DEP)