Is anyone in this area looking at balanced block designs? There's a rich area of math concerned with placing elements in sets subject to various constraints (e

Is anyone in this area looking at balanced block designs? There's a rich area of math concerned with placing elements in sets subject to various constraints (e.g. minimizing cardinality of intersections). It's been a long time since I looked at that stuff, but I don't remember how easy it is to produce solutions for arbitrary N, which you would want to be able to increase as demand increases.