After two years in college, 45% of students showed no significant gains in learning; after four years, 36% showed little change.
Students also spent 50% less time studying compared with students a few decades ago, the research shows.
He noted that students in the study, on average, earned a 3.2 grade-point average. "Students are able to navigate through the system quite well with little effort," Arum said.
Other details in the research:
•35% of students report spending five or fewer hours per week studying alone. Yet, despite an "ever-growing emphasis" on study groups and collaborative projects, students who study in groups tend to have lower gains in learning.
•50% said they never took a class in a typical semester where they wrote more than 20 pages; 32% never took a course in a typical semester where they read more than 40 pages per week.