How do you explain the success of schemes like the Clink Restaurant?

http://www.independent.co.uk/life-style/food-and-drink/features/the-clink-restaurant-in-brixton-pris...

"The aim is simple - to reduce re-offending rates, which on average hover below 50 per cent, but at less than 10 per cent among the more than 100 released prisoners who have so far trained in Clink restaurants."