An occupation is classified into 1 of 11 categories that best describes the postsecondary education or training needed by most workers to become fully qualified in the occupation. The categories are as follows: first professional degree; doctoral degree; master's degree; bachelor's or higher degree, plus work experience; bachelor's degree; associate degree; postsecondary vocational award; work experience in a related occupation; long-term on-the-job training; moderate-term on-the-job training; and short-term on-the-job training.