Grades vs. Rubrics

I’m not sure a grade ever told me anything useful about how I could get better. Why don’t we use rubrics and metrics instead? SAT, AP, and some GRE all grade using a rubric. Wouldn’t it be nice to see where and why I lost points and how to make it better next time. With my students were always guessing at the meaning, or the why. It’s not effective. Education should be clear, concise and focused on building, not on marking down.