The most common criticism of the A-level system is an accusation of grade inflation . The press have noted the steady rise in average grades for several consecutive years and drawn the conclusion that A-levels are becoming consistently easier.  In an educational report Robert Coe compared students' scores in the ALIS ability test with equivalent grades achieved in A level exams over the period of approximately 20 years. He found that students of similar ability were achieving on average about 2 grades lower in the past than they were in the present. In the case of maths it was nearer to grades lower.