Schools are arranged by conference to ensure that schools compete on a regular basis with other schools in the geographic area of a similar size. The conferences are A (the smallest), AA, AAA, AAAA, AAAAA and AAAAAA (the largest). The corresponding alphanumeric designations (1A, 2A, 3A, 4A, 5A, and 6A) are used in everyday conversation (as well as in this article), but officially UIL only uses the alphabetic designations. The general guideline is that the UIL desires between 220 and 245 schools in Conference AAAAAA, at least 200 schools in Conferences AA, AAA, AAAA, and AAAAA with the grades 9–12 enrollment ratio for those classes no greater than 2.0 between the largest and smallest school in each class.