In general, instructional faculty and staff at 4-year doctoral institutions had lighter teaching loads than those at 4-year nondoctoral institutions, who in turn had lighter loads than those at 2-year institutions. At the same time, instructional faculty and staff at 4-year doctoral institutions were more likely than their colleagues at 4-year nondoctoral and 2-year institutions to have teaching assistants in some or all of their undergraduate classes.

With some exceptions, undergraduate teaching loads at 4-year institutions were inversely related to faculty's academic rank and tenure status. Instructional faculty and staff with higher academic ranks or tenure status (e.g., full professors or tenured faculty) generally had lighter teaching loads than those with lower academic ranks and tenure status (e.g., instructors/lecturers or nontenure-track faculty). This relationship was more apparent at 4-year doctoral institutions than at 4-year nondoctoral institutions.