The International Baccalaureate has revealed how many of its schools will use exams to assess students under its controversial “dual route” approach for 2021.

The IB has told Tes that 70 per cent of its schools worldwide will take the exam route.

It is understood that in most cases the decision over whether exams or teacher assessment should be used has been taken on a countrywide basis.

This week the IB revealed that its exams in the UK were being cancelled, although the means of teacher assessment had not been confirmed with Ofqual yet.

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The IB outlined its dual route, with schools in some parts of the world taking exams while others award grades through teacher assessment, earlier this month.

International Baccalaureate: The ‘dual route’ approach to awarding grades

Following a January survey of 3,000 schools in more than 152 countries, the IB said it was working with schools to “determine which of the two pathways is best for their region: written examinations, where they can be administered safely, or an alternative route using a combination of internal assessment coursework and teacher-predicted grades, where they can’t”.

But the idea has proven controversial with students, who have argued that it is unfair for some students to take exams and not others, and that exams will not offer a level playing field given the varying levels of learning loss for those taking them.