The Department for Education's own workload review found that detailed written marking is one of the most time-consuming things teachers do — and one of the lowest-impact. Triple-marking, dialogic marking and 'deep marking' policies are linked to teacher burnout without measurable pupil benefit.
What works is selective marking: pick a small number of pieces per term to mark in detail, mark the rest with a quick code or symbol, and use whole-class feedback for common errors. Most schools' published marking policies now reflect this — but old habits persist.
