Lawson's test was used with 66 ninth grade and 63 tenth grade students. Results show: that boys outperformed girls; a small correlation between achievement in science and mathematics and the Lawson test; and that Israeli students achieved significantly higher than United States students on the Piagetian skills measured by the test. (Author/JN)

Reports results of a study investigating the ability of college students to solve problems using proportional reasoning. Also discusses implications for consideration of Piagetian cognitive level of students in planning college courses. (CS)