Here you can find the commissioned research at the GfK Institute for the 2015-2016 school year. The reference universe is the over 2 million students of Italian secondary schools.
First, data from the Ministry of Education relating to upper secondary education in Italy were analyzed, after which the characteristics of an "ideal sample" were identified. From all the schools that took part in the initiative, a sample was drawn parallel to the ideal one.
Click here to download the summary of this research