In many middle schools, The Lion, the Witch and the Wardrobe is taught by three or four teachers at the same grade level. Each one runs the unit a little differently, and each one grades a little differently. Students in one classroom can earn a very different score than students in the next for the same quality of work.

A common assessment is the usual fix. Everyone gives the same prompt, uses the same rubric, and agrees on what strong work looks like. Done well, it gives the department reliable data and gives students a fairer experience.

Done poorly, it becomes a compliance exercise that teachers resent. The difference is usually how the department builds it. A process that respects teacher judgment while aligning on standards tends to stick.

Here is a practical way to get there.

Agree on the prompt and the rubric first

Sit down together and choose one essay prompt that fits how everyone teaches the book. Then build a single rubric with clear level descriptions. Spend most of the meeting on the descriptions, because that is where disagreements hide.

• One shared prompt with room for teachers to add their own scaffolds
• A rubric with four or five criteria and plain-language level descriptions
• A short list of anchor essays that show each score level
• An agreed timeline for drafting, feedback, and the final due date
• A plan for how results will be shared and used afterward

Calibrate with anchor papers

Have every teacher score the same three or four sample essays independently. Then compare. Where scores differ, talk through why until the group agrees on what each level looks like.

This calibration meeting is the most valuable hour in the whole process. It surfaces hidden assumptions about what counts as evidence or how much conventions matter. Afterward, everyone leaves with a shared picture.

Keep scoring consistent through the grading window

Even calibrated teachers drift over a long grading period. A useful habit is to swap two or three essays with a colleague and compare scores midway through. Large differences signal a need to recheck the rubric.

AI grading can provide a consistent baseline across classrooms. When every teacher runs their essays through a tool like GraideMind with the same rubric, the first-pass scores come from the same standard. Teachers then review and adjust, and the department can compare results with more confidence.

Use the results to improve teaching

After grading, meet again and look at the numbers by criterion. Where did students do well, and where did they struggle across classrooms? That points to instructional strategies worth sharing.

Keep the tone collaborative, not competitive. The goal is not to rank teachers but to learn what is working. Departments that treat common assessments as a learning tool tend to keep them going year after year.