Unless otherwise noted in a specific report, the AACRAO member institution size, type and control categories are based on the following definitions and sources: 
The enrollment value used to delineate the institution's size category is defined as full-time enrollment plus 1/3 of part-time enrollment and is based on the enrollment reported by the institution to the U.S. Department of Education's National Center for Education Statistics (NCES). 
Institution type and control values are also defined by and verified through NCES criteria.