How do you get young adults back into education if they dropped out and had a negative experience of learning?
How do you show those who failed first time round that the door is still open? How do you get out-of-work youngsters to decide that it's worth their while to get qualifications?
Reaching out to the educationally excluded isn't some kind of philanthropic exercise. It's a very practical and often intractable economic problem for many developed countries.
It is a worst-of-both-worlds position of having unemployed youngsters at the same time as having firms struggling to cope with a shortage of skilled staff.
Denmark is no exception. About 12% of the country's 15 to 29-year-olds are counted as not in education, employment or training or "Neet". At the same time there are "talent shortages" for a range of skilled jobs which means recruiting overseas.
Connected classroom
But where are these young adults going to study?
Voksenuddannelsescenter Syd - or VUC Syd - is offering a different kind of model for such young learners.
This adult education centre, beside a fjord in Haderslev in southern Denmark, is based in a state-of-the-art, £25m building that seems to have gone to great lengths to look nothing like a school.