The physics of strongly correlated fermions and bosons in a disordered envi­ ronment and confined geometries is at the focus of intense experimental and theoretical research efforts. Advances in material technology and in low temper­ ature techniques during the last few years led to the discoveries of new physical of atomic gases and a possible metal­ phenomena including Bose condensation insulator transition in two-dimensional high mobility electron structures. Situ­ ations were the electronic system is so dominated by interactions that the old concepts of a Fermi liquid do not necessarily make a good starting point are now routinely achieved. This is particularly true in the theory