If you are assigning scores to questions on a test, I used to make hard questions worth more points than easy questions, because I thought that they should carry a greater reward for correct answers. This caused problems because many students who had a decent level of understanding of material were not getting the questions worth the most points on their assessments.
My current approach is the exact opposite, an easy question should be worth lots of points, and a tough questions should be worth a few. The few points are enough to separate out kids who are good from those who are excellent, but students who do well on a test should not be receiving terrible scores. This tends to agree with our intuition about what a student’s total score should be.
I think I figured this out sometime last year, and I’ve been thankful for it ever since.