Schools were ranked in four categories, depending on the number of classrooms showing high numbers of changes.
Schools with 25 percent or more of classrooms flagged were placed in the “severe concern” category. Schools with 11 percent to 24 percent of classrooms flagged went into the “moderate concern” category. Those with 6 percent to 10 percent of classrooms flagged were placed in the “minimal concern” category.
The remainder, with 5 percent or fewer classrooms flagged, were categorized as “clear.” The state said this group should accommodate classes where some unusual circumstance created an innocent outlier. The state said the chances of a classroom being flagged erroneously were less than one in 1,000.