By Alfie Kohn
You can tell a lot about a teacher’s values and personality just by asking how he or she feels about giving grades. Some defend the practice, claiming that grades are necessary to “motivate” students. Many of these teachers actually seem to enjoy keeping intricate records of students’ marks. Such teachers periodically warn students that they’re “going to have to know this for the test” as a way of compelling them to pay attention or do the assigned readings – and they may even use surprise quizzes for that purpose, keeping their grade books at the ready.
Frankly, we ought to be worried for these teachers’ students. In my experience, the most impressive teachers are those who despise the whole process of giving grades. Their aversion, as it turns out, is supported by solid evidence that raises questions about the very idea of traditional grading.
Three Main Effects of Grading
Researchers have found three consistent effects of using – and especially, emphasizing the importance of – letter or number grades:
1. Grades tend to reduce students’ interest in the learning itself. One of the most well-researched findings in the field of motivational psychology is that the more people are rewarded for doing something, the more they tend to lose interest in whatever they had to do to get the reward (Kohn, 1993). Thus, it shouldn’t be surprising that when students are told they’ll need to know something for a test – or, more generally, that something they’re about to do will count for a grade – they are likely to come to view that task (or book or idea) as a chore.
While it’s not impossible for a student to be concerned about getting high marks and also to like what he or she is doing, the practical reality is that these two ways of thinking generally pull in opposite directions.
2. Grades tend to reduce students’ preference for challenging tasks. Students of all ages who have been led to concentrate on getting a good grade are likely to pick the easiest possible assignment if given a choice (Harter, 1978; Harter and Guzman, 1986; Kage, 1991; Milton et al., 1986). The more pressure to get an A, the less inclination to truly challenge oneself. Thus, students who cut corners may not be lazy so much as rational; they are adapting to an environment where good grades, not intellectual exploration, are what count. They might well say to us, “Hey, you told me the point here is to bring up my GPA, to get on the honor roll. Well, I’m not stupid: the easier the assignment, the more likely that I can give you what you want. So don’t blame me when I try to find the easiest thing to do and end up not learning anything.”
3. Grades tend to reduce the quality of students’ thinking. Given that students may lose interest in what they’re learning as a result of grades, it makes sense that they’re also apt to think less deeply.
More Reasons to Just Say No to Grades
The preceding three results should be enough to cause any conscientious educator to rethink the practice of giving students grades. But wait – there’s more.
4. Grades aren’t valid, reliable, or objective.
5. Grades distort the curriculum.
6. Grades waste a lot of time that could be spent on learning.
7. Grades encourage cheating.
8. Grades spoil teachers’ relationships with students.
9. Grades spoil students’ relationships with each other.
The most destructive form of grading by far is that which is done “on a curve,” such that the number of top grades is artificially limited: no matter how well all the students do, not all of them can get an A. (...)
Sadly, even teachers who don’t explicitly grade on a curve may assume, perhaps unconsciously, that the final grades “ought to” come out looking more or less this way: a few very good grades, a few very bad grades, and the majority somewhere in the middle. But as one group of researchers pointed out, "It is not a symbol of rigor to have grades fall into a 'normal' distribution; rather, it is a symbol of failure -- failure to teach well, failure to test well, and failure to have any influence at all on the intellectual lives of students” (Milton et al., 1986, p. 225).
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