One of the big frustrations I have when discussing grades with others (whether that be teachers, students, or parents) is that the argument frequently comes down to an unfounded faith in percent. The argument goes something like this:
- Well, we have to have grades. (I disagree.)
- You have to set a cut off somewhere. (Why?)
- This is the percent the student got, math never lies, so therefore this grade is accurate and fair. (Oh really?)
It's toward the end of the semester and a student has an 89.5% in a class. They turn in a review guide and get a 20 out of 20 on it. What happens to their overall grade? Does it go up? Stay the same? Or go down?
The vast majority of folks say it will go up. The answer, of course, is it depends. In this particular case, the grade goes down. Yes, a student who has an 89.5% in the class turns in their review guide assignment like a good student should and gets a 100% on it, yet their grade still goes down.
How is that possible? Well, this teacher weights their grades by category. This assignment falls in the Homework Category which gets a weight of 10%. Because this teacher previously offered some extra credit (which is a whole different blog rant), the student's percentage in the homework category before the review guide was turned in was 105.7%. After turning in her correctly done review guide, her percent in that category drops from a 105.7 to a 105, and her overall grade drops from an 89.5 to an 89.4 (which, for many teachers, is from an A to a B - most teachers in my building will "round up" an 89.5).
In effect, the student is penalized for turning in a perfect assignment. What grade should they get?
Recent Example #2
At the end of the semester a student has an 89.1% in a class out of a total of 2,389 points. What happens to their overall grade if they scored 1 point higher on one single assignment earlier in the semester?
Again, of course, it depends. In this particular case, it would raise their overall grade to 89.815% which, again for most teachers in my building, is probably the difference between a B and an A. Some of you will doubt that 1 point out of 2,389 can raise their grade from an 89.1 to an 89.815, but it can. This teacher weights categories as well, and one of their categories is titled Homework Checks and is worth 10% of the overall grade. Here is the student's scores in that category:
See that Slope Quiz on October 31st that the student scored a 7 out of 8 on? If they had received an 8 out of 8, their category percentage rises to 100%, which increases their overall percentage in the class by 0.715%, from 89.1 to 89.815.
One point, on one quiz, on one day. What grade should they get?
Recent Example #3
Here's a student's percentages in different categories for a particular class:
Tests & Quizzes: 88%
Lab Reports: 88%
Final Exam: 74%
Well, we could have a long and valuable philosophical discussion about this, but the point of this example is that this student could get two different grades in the same class at my school. How? It depends on what teacher they have and how that teacher weights their categories. Here's what it looks like for three teachers of this class in my building:
And here's what that translates to for the student's percentages in each category:
These teachers all teach the same class. Students are randomly scheduled into their class by the computer. This student could have performed exactly the same and, in one class, received an 89.2% (a B), an 89.5% (probably an A, but possibly a B), or 90.4% (an A), because the teachers choose to weight the categories differently. Oh, and there are two other teachers of this section that grade on total points, so the student would have yet another percentage that we can't determine from this information.
The same student, in the same class, with the same curriculum, at the same school. What grade should they get?
All three of these examples are real, from my school, from the end of last semester, although I did manipulate the overall percentages for effect (but the assignments and student scores on examples 1 and 2, and the teacher weights on all three examples, are real).
So, even if you believe grades are worthwhile (or if you don't believe grades are worthwhile but you have to give them anyway), I would at least ask that you spend a little more time thinking about them. Your computer grade book is mathematically accurate; it computes exactly what you tell it to compute. But that doesn't mean it makes sense. You are the professional, and if you give a grade to a student you should come up with a more thoughtful way to assign that grade than simply relying on a percentage.