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Exploration of questions from GCSE Maths A: Identifying the types of question that candidates find the most and least demanding, within a topic
By Melissa Jackson, Rachel Lismore-Burns Published 23 Mar 2012
Teachers' estimates of candidates' grades: Curriculum 2000 Advanced Level Qualifications
By Debra Dhillon Published 19 Oct 2010
Predictive models of question difficulty - A critical review of the literature
By Debra Dhillon Published 1 Feb 2003