Overall, instructional faculty and staff at 4-year doctoral institutions were less likely to provide instruction to undergraduates than were their colleagues at 4-year nondoctoral and 2-year institutions. Two-thirds (67 percent) of full-time faculty at 4-year doctoral institutions reported providing at least one type of instruction to undergraduates, compared with 90 percent of their counterparts at 4-year nondoctoral institutions and 98 percent of those at 2-year institutions. Among full-time faculty who taught classes at any level, 69 percent of those at 4-year doctoral institutions reported teaching at least one undergraduate class and 44 percent reported teaching such classes exclusively, again lower than the percentages for their counterparts at 4-year nondoctoral institutions (90 percent and 74 percent, respectively).