Student graduation from high school with a regular high school diploma is an important indicator of school success and a significant indicator of student college and career readiness. Under the ESEA, RI is required to calculate four-year adjusted cohort graduation rate (ACGR). The four-year ACGR is the number of students who graduate from high school within four years with a regular high school diploma divided by the number of students who form the adjusted cohort for the graduating class. The cohort is based on the number of students who enter grade 9 for the first time adjusted by adding into the cohort any student who transfers in later during grade 9 or during the next three years and subtracting any student from the cohort who transfers out.