I'm working in a survey to idle youth in Chile. I need some validated questions or similar studies. We have interest to compare this population with other realities.
Look information about "Ni Ni" generation, in Spain. There studies with characterization about this population, for example "Jovenes Españoles 2010", published by SM Foundation.
I think it depends upon what you mean by 'idle youth'. Not economically active? Not in education? Spending too much time in front of the TV eating potato chips? Or all of the above.