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This article is written in memory of Professor Helge Strömdahl (1945-2018), the former director of the Swedish National Graduate School in Science and Technology Education (FontD). Helge took his Ph.D. at Gothenburg University in 1996 with the dissertation "On mole and amount of substance. A study of the dynamics of concept formation and concept attainment". He was director of the Swedish National Graduate School in Science and Technology Education (FontD) from 2001 until his retirement indoi:10.5617/nordina.7066 fatcat:gyn2mn2cavgadmxhcanvczjknm