Why Are Some GCSE Examination Questions Harder to Mark Accurately than Others?
It has long been established that marking accuracy in public examinations varies considerably among subjects and markers. This is unsurprising, given the diverse cognitive strategies that the marking process can entail, but what makes some questions harder to mark accurately than others? Are there distinct but subtle features of questions and their mark schemes that can affect accuracy? Such features could potentially contribute to a broad rationale for designating questions to markers according to personal expertise. The aim of this study was to identify question features that can distinguish those questions that are marked highly accurately from those that are marked less accurately. The study comprised an exploration of maths and physics questions from past GCSE examinations, which were marked in an experimental setting by groups of markers and yielded differing marking accuracies. The questions also varied in their difficulty for GCSE candidates, and in the cognitive strategies nee
