This volume contains the correlation matrices used in the regression analyses reported in Section Three of the Educational Opportunities Report. Correlation matrices are given in each of the five test grades--twelve, nine, six, three, and one--for ten racial and regional groups; in the Total Nation for Mexican Americans, Puerto Ricans, Indian Americans, Oriental Americans, Negroes, and whites, and also for Negroes in the North, Negroes in the South, whites in the North, and whites in the South. Preceding each of the separate grades is a list of the names of the variables appearing in the matrix, and the number which identifies each of the variables used. The variables used are indexes combining several items from questionnaires. These indexes from which the regression variables were selected are described in Section 9.9 of the Report. One hundred and three variables were constructed at each grade level (though with some variables missing at lower levels). In the computer printouts reproduced here, these are labeled as Dependent (10 test scores), Student (15 student questionnaire variables), Teacher (20 teacher-aggregate variables), Principal and Superintendent (31 principal and superintendent questionnaire variables), and School environment (21 student-aggregate variables). (Author/JM)