This project aims at investigating some crucial issues in globally supersymmetric and Supergravity theories. Firstly, it focuses on perturbative and non-perturbative sources of Supersymmetry Breaking in the low-energy effective Supergravity description of Superstrings and M-theory. These include Gaugings and Fluxes in compactifications from higher dimensions, Gaugino Condensation and other non-per ...