Narrow the question
Begin with the writing skill your team wants to understand. Use a selection of recent, anonymised samples to test whether that need is shared across classes. Keep differences between year levels and tasks visible.
Agree on the next check-in
Choose a teaching approach, a short time frame, and the evidence teachers will bring back. Discuss what changed in the work and what still needs attention. Avoid treating a single comparison as proof of a whole-school trend.
