No matter how hard you try, you realize there’s a good chance you’re grading some students more harshly than they deserve, and giving others more credit than they deserve. This doesn’t have anything to do with favoritism (a whole other problem), but with human error and weakness. Your temperament and disposition change over the hours or days you spend grading an assignment. In fact, your frame of mind can change in moments for any number of reasons: Five weak essays in a row can put you in a foul mood; fatigue can set in; a too-hot or too-noisy room can set your nerves on edge. Maybe you’re suddenly reminded that you have only 48 hours left to finish clearing out your deceased parent’s apartment. How can any teacher be confident that his or her assessment of student work is always fair and accurate in the face of such vagaries? An essay that earns a B+ at one moment might earn a B- the next day. It shouldn’t be that way, but any honest teacher will admit it’s true.
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