Three teachers, three sections, one Things They Carried essay. By the end of the grading window, one class has an average of 88, another sits at 79, and a parent wants to know why. Situations like this happen in nearly every department that shares an assignment.

The gap rarely comes from carelessness. Teachers hold slightly different ideas of what a strong claim looks like, how much summary is too much, and how to weigh conventions against ideas. Without a shared process, those differences turn into unequal grades for students who did equal work.

Calibration is the fix. It is the practice of grading a few papers together, comparing scores, and adjusting until the department agrees on what each level means.

Here is how departments can run a calibration session for a Things They Carried assignment without eating up a full afternoon.

Start with anchor papers

Pick three or four essays from a previous year that represent different score levels. Remove names, and have every teacher score them independently before meeting. Then compare results and discuss the differences.

• Choose anchors that cover high, middle, and low performance
• Have each teacher score before any discussion begins
• Record scores side by side to see where gaps appear
• Talk through the papers where scores differ by more than a level
• Save the agreed anchors to use in future years and with new teachers

Revise the rubric language where teachers split

When teachers disagree on a paper, the rubric wording is usually the culprit. Phrases like sufficient analysis mean different things to different people. Rewrite those descriptors with concrete behavior so every reader can apply them the same way.

Keep the revised rubric in a shared document, and note the date. Over a few years, the department builds a stable standard that new teachers can learn quickly.

Check consistency during the grading window

Calibration should not end after the meeting. Have teachers swap a few essays midway through grading and compare scores again. Drift is common, and catching it early prevents bigger problems.

Some departments also track score averages by section. A large gap is not proof of a problem, but it is a useful prompt for a conversation.

Use shared tools to hold the standard

A shared AI grading tool can help reinforce the calibrated rubric. GraideMind applies the same criteria to every essay regardless of which section it comes from, so it can serve as a consistent reference point when teachers compare notes. Teachers still make the final call, but they start from a common baseline.

For department chairs, that consistency also makes it easier to explain grading practices to administrators and families, since the standard is written down and applied the same way across classrooms.