Guri and Nils are the editors and have worked hard to produce a high-quality issue of ZDM. The issue contains many interesting articles, such as: Perception of student errors under time limitation: are teachers faster than mathematicians or students? by Lena Pankow, Gabriele Kaiser, Johannes König, and Sigrid Blömeke, or Does schooling actually perpetuate educational inequality in mathematics performance? A validity question on the measures of opportunity to learn in PISA by Kajsa Yang Hansen and Rolf Strietholt. Guri and Nils set the stage in their editorial.
Congratulations!
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The special issue can be found here.