Researchers at the Regional Educational Laboratory Southwest, operated by AIR, conducted a study to examine Algebra II completion and failure rates in Texas for high school students. This period spans (a) the point at which Texas began implementing the 4x4 curriculum that required four courses each in English, math (including Algebra II), science, and social studies, and (b) when the state moved to the new Foundation High School Program—which eliminates Algebra II as a math requirement—with the 2014/15 cohort.