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At the end of the seminar the tutor asked: "What questions would you like in your finals? Some years I ask students what questions they want, some years I ask them to choose from a list, some years I set an unseen exam. It makes not a blind bit of difference to the results." This was at the London School of Economics in the 1960s. Evidence-based innovations in assessment have a long history ("Class allowed to set exam", June 30).

David Baume

Manchester