What we know about the theoretical foundation of duality in electron scattering

We consider some of the things that we do understand about the theoretical underpinnings of duality, including some specific items including why the resonance peak/background ratio is constant in general, why it fails for the Delta(1232), what we might expect for scaling and duality with longitudinal or spin-dependent structure functions, and what kind of scaling or duality we might expect for semiexclusive processes.