I am a teacher and develop the program by the way. Therefore, not everything is as I imagine. We ask for your understanding. The program helps to create the clef. When the results of the students are entered, the grading is displayed at the same time. In addition to the normal school grading system, the grading system of the upper grades is also supported. Both rating and error keys can be created. Changes to note boundaries can be made graphically. As a result, one can immediately observe the effect on the distribution of grades and the average grade. By graphing student performance on the clef, you can quickly see where changes would actually affect you.