Will the New System for Giving Schools Letter Grades Be Fair?
Does the new system for giving letter grades to schools have a fundamental flaw?
In the State Board of Education meeting of October 5th, Dr. Bennett asked the board to defer all other business to focus on the new criteria for assigning letter grades. A proposed rule was presented and discussed by the board with the understanding that a revised rule would be brought to the board on November 2nd for their approval. Dr. Bennett said he wanted to quickly settle on a plan in order to apply for a federal waiver of the No Child Left Behind penalties, an offer made available this fall by Secretary of Education Arne Duncan.
The first step in the new letter grade proposal is to determine the performance of the school on math and English tests, following a traditional system of 90% = A, 80% = B, 70% = C, and 60% = D. That grade can then be raised or lowered based on improvement, and improvement is based on whether students are achieving high growth as measured by the Indiana Growth Model.
Here lies the fundamental flaw. The Indiana Growth Model is a norm-referenced measure. Norm-referenced measures dictate quotas of high achievement based on the bell-shaped curve. The Indiana Growth Model designates 35% of all students as high growth and 35% of all students as low growth. There is a limited quota each year of high growth students.
To cite one example of a proposed improvement bonus, a school’s lowest 25% of students must score high growth to a level higher than the 35% average performance: 42.5% in English and 44.9% in math. With only 35% of students in the state showing high growth by definition, we know in advance that the predictable result is that only a few schools will get this bonus or the other bonuses. Their grade will therefore be based on the overall performance of the entire school, and the words in PL221 calling for categories based on improvement will be ignored:
“IC 20-31-8-3 Categories or designations of school improvement established Sec. 3. The state board shall establish a number of categories or designations of school improvement based on the improvement that a school makes in performance of the measures determined by the board with the advice of the education roundtable. The categories or designations must reflect various levels of improvement.”
Policymakers in the 1990’s abandoned the use of norm-referenced measures for the purpose of high-stakes testing because, by definition, only a limited number will score high on the normal curve. Instead, policies were based on criterion-referenced measures, wherein a criterion is set and all students who achieve that level can pass. Limiting success to an ever changing group of 35% is not fair and guarantees a quota of 65% that will not make the grade. Yet, that unfairness is being embedded in the new criteria for school letter grades.
To my knowledge, Indiana is the only state going down this road of judging schools based on norm-referenced measures. Other states know better, and so should Indiana.


