Don Scaloni, who was the first provincial of the Salesian congregation in Belgium, published in 1903 the second edition of 'Capital & Travail'. This was a manual on social economy, which he used in the vocational school of Liège to teach his pupils the basics of social economy during their last 3 years of school. As such he followed the vocational school curricula which were being developed by the Salesians in Torino.
Don Bosco initiated the useof apprenticeship contracts, with the first contract of apprenticeship entered into in November 1851, defending young people’s rights to access the labour market under fair conditions.
This video is a good introduction on NEETs, including defitions and youth work approaches to tackle it.