Oregon standardized tests measure the progress of students from 3rd grade to 8th grade, and 10th grade. In fifth, eighth, and tenth grades, schools may also give an optional OAKS social studies assessment. The Oregon Assessment of Knowledge and Skills measures how well students have mastered Oregon Content Standards, and reports student performance in each subject. The OAKS Assessment system is aligned to the 2009 Oregon Science content standards, and the 2001 Oregon Social Sciences content standards.