Information supplied by research directors of 48 large public school systems in 24 States was tabulated to indicate usage of various achievement, aptitude, and interest tests. Tabulations include instrument usage of 43 achievement tests at the elementary level (grades K-6), 43 at the middle level (grades 7-9), and 42 at the secondary level (grades 10-12); 22, 16, and 13 aptitude tests at the same three levels, respectively; three interest tests at the middle level; and two interest tests at the secondary level. (JK)