Marking student work is an important part of teaching. It provides feedback to students, allows teachers to differentiate instruction, and helps with planning. The document outlines several strategies for effective marking, including marking all student work at least once a week, using correction codes, choosing exemplar work to share with classmates, and giving numbered feedback questions for students to answer. The goal of marking is to improve student learning by identifying and addressing errors or gaps in understanding. It should also be a manageable task for teachers.