At community colleges, graduation means attainment of a certificate or associate degree. However, many students attend community colleges to take lower-division courses for a bachelor's degree, and some transfer to a four-year institution without obtaining a credential. From the perspective of the community college, these students have finished a curriculum that prepared them for transfer and, therefore, should be considered as having completed. Some states even track and report which community college students graduate from other institutions. Most sources, however, do not specify what proportion of transfer students have finished the coursework required for upper-division standing at the four-year college, and research suggests that many students transfer without reaching this threshold. A completion rate that combines transfer and degree attainment is sometimes referred to as a "success rate."