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White space in assessment materials – 'space to think' or a 'waste of space'?
By Charlotte Stephenson, Bryan Maddox
Published 1 Jun 2021 -
Difficulty plots: DIF analysis without the partial credit model
By Elizabeth Harrison
Published 5 May 2017 -
Predictive models of question difficulty - A critical review of the literature
By Debra Dhillon
Published 1 Feb 2003