According to one study, more than a third of college students don't measurably improve in critical thinking skills through four years of education.

 

According to the study, one possible reason for a decline in academic rigor and, consequentially, in writing and reasoning skills, is that the principal evaluation of faculty performance comes from student evaluations at the end of the semester. Those evaluations, Arum says, tend to coincide with the expected grade that the student thinks he or she will receive from the instructor.