Scaffolding of experimental design skills Luca Szalay, *a Zoltán Tóth,b Réka Borbásc and István Füzesid Abstract The results of an earlier four-year longitudinal research study on the development of experimental design skills led to the conclusion that 12–13 year old students probably need more help to design experiments than had been offered to them in that project. This paper reports the findings of the first year of a further four-year empirical research project.