Kilhamn, C., Strømskag, H., Hästö, P., Liljekvist, Y. and Häggström, J. 2019. Editorial. NOMAD Nordic Studies in Mathematics Education. 24, 3-4 (Nov. 2019), 1–13. DOI:https://doi.org/10.7146/nomad.v24i3-4.149021.