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 Class SplitHow is the split between classes determined for 2008-2009 ?A complete list of schools entering a given activity is computer generated. The report lists the schools from the highest enrollment to the lowest. The enrollment figure that is used is based on a school's 7-8 enrollment. The enrollment figures are received from the Illinois State Board of Education. Two-Class ActivitiesThe highest fifty percent of the schools entered in the activity are Class AA and the lowest fifty percent become Class A. For example, if there are 250 schools entered in boys baseball, then the 125 schools (50%) with the largest 7-8 enrollment become Class AA and the bottom 125 schools become the Class A schools in volleyball. Since there is no "magic number" at where the cutoff between Class AA and Class A occurs, the actual number for the cut-off will vary from sport to sport and from year to year. It all depends on the enrollment of the schools and the number of schools that enter the activity each year. It is entirely possible that a school is Class A for one activity and Class AA for a different activity. IESA has classification in all athletic activities except boys wrestling. Three-Class ActivitiesThe highest thirty-three percent of the schools entered in the activity are Class 3A, the next thirty-three percent of the schools entered in the activity are Class 2A, and the lowest thirty-three percent become Class 1A. For example, if there are 300 schools entered in boys baseball, then the 100 schools (33%) with the largest 7-8 enrollment become Class 3A, the 100 schools that fall between the top 33% and the bottom 33% are Class 2A, and the bottom 100 schools become the Class 1A schools in baseball. Since there is no "magic number" at where the cutoff between classes occurs, the actual number for the cut-off will vary from year to year. It all depends on the enrollment of the schools and the number of schools that enter the activity each year. It is entirely possible that a school is Class A for one activity and Class AA for a different activity. IESA has classification in all athletic activities except boys wrestling. Four-Class ActivitiesThe highest twenty-five percent of the schools entered in the activity are Class 4A, the next twenty-five percent of the schools entered in the activity are Class 3A, the next twenty-five percent of the schools entered in the activity are Class 2A, and the lowest twenty-five percent become Class 1A. For example, if there are 340 schools entered in girls volleyball, then the 85 schools (25%) with the largest 7-8 enrollment become Class 4A, the 85 schools that fall between the top 25% and the bottom 50% are Class 3A, the 85 schools that fall between the bottom 25% and the top 50% are Class 2A, and the bottom 85 schools become the Class 1A schools in volleyball. Since there is no "magic number" at where the cutoff between classes occurs, the actual number for the cut-off will vary from sport to sport and from year to year. It all depends on the enrollment of the schools and the number of schools that enter the activity each year. It is entirely possible that a school is Class A for one activity and Class AA for a different activity. IESA has classification in all athletic activities except boys wrestling.
NOTE: The split number represents the enrollment at which the break between classes occurs. For example, with a split number of 155, schools with enrollment up to 155 will be in Class A, schools with enrollment of 156 or more will be in Class AA. IESA Member School Enrollments
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