This document discusses using "zonal marking," also known as "yellow box marking," as a way to provide feedback to students on their work. Teachers can vary the size of the yellow box depending on the expected length of the student's response. They can also vary the improvement instructions, such as asking students to complete or improve the original task, answer a challenge question, or apply a target to another situation. Teachers are also encouraged to have students use the yellow box to indicate which part of an extended answer they want the teacher to focus on providing detailed feedback for.