In order to make an intelligent advance in any school practice a knowledge of what schools are doing in that practice is almost indispensable, since a transition in procedures must be a growth from the one to the other. This bulletin gives this background of facts concerning the use of tests and examinations by the different subject departments in high schools. It considers these facts and makes suggestions for the improvement of the procedures found. The variations in testing practices among different departments are considerable, reflecting the types of standardized tests available in the different subjects, and the ability and interest of teachers in constructing and using different types of tests. This bulletin should be of value, first of all, to high-school principals, heads of departments, and progressive high-school teachers, since it describes testing practices in schools and makes suggestions for their improvement. It is hoped that it will be of use also to curriculum workers, to persons interested in devising tests for the secondary field, and to instructors in teacher-training institutions. Two appendices are included: (1) Selected references on testing on the secondary level; and (2) List of publishers of standardized tests on the secondary level. (Contains 19 tables and 2 footnotes.) [Best copy available has been provided.]