Ten years ago the department of mathematics of Wichita High School began grouping students according to ability into three groups—honor, medium, and slow. At first we used an intelligence test as a part of the basis of classification. We have used the Stone Reasoning test, the Otis Intelligence Test, and the Terman Test. With or without an intelligence test we have always used the judgment of the teacher who had the pupils the previous semester and the one receiving the pupils. Not always have we given an intelligence test but we do feel that we lose some of the certainty of placing and at times find our first judgment wrong without the test. A student may be very good in the mechanics of elementary algebra, doing the original reasoning required there in a satisfactory manner, and yet lack the power of analysis required in geometry, advanced algebra, and trigonometry. Students naturally group themselves according to their analytic and reasoning power and an intelligence test discovers this grouping more readily than the regular classroom procedure.