Speaking of Headcanon
Just when I think I'm teetering on the edge of too creepy and gross, someone shows me how it's really done:
Of course, great software architects and bioengineering minds don’t just develop overnight. That’s why the District’s intense focus on technical education must begin very early on. Just before the age of 3, all District 3 youth are tested and ranked by their abilities for appropriate placement within the school system. The advanced placement children are then appropriated through an annual “district roundup,” where they are freed from the natural constraints and intellectual limitations of a family setting by living and training at a state-of-the-art educational facility managed by the Panem Advanced Technical Training system, or PATT. Here the very best minds are trained to build a bright future for the nation and share a lifetime comradery in achievement and service.