Affiliation: | 1. Department of Special Needs Education, University of Oslo , Norway christian.brandmo@isp.uio.nohttps://orcid.org/0000-0003-3641-6414;3. University of Deusto , Spain https://orcid.org/0000-0003-0859-3616;4. Oxford University Centre for Educational Assessment , UK https://orcid.org/0000-0002-1402-7031 |