Feedback students can act on — specific, linked to the criteria, and forward-looking. Not a praise sandwich. Fill the parts; we'll shape it into something useful and humane.
Name the thing they did well, with evidence.
The single highest-leverage improvement (not five).
Concrete and doable on the next task.
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Why not a sandwich? Praise-criticism-praise trains students to brace for the middle and forget the rest. Lead with a genuine, specific strength; give one clear thing to develop; make the next step doable. That's what moves work forward.
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