An enormous effort has been made to understand and model the nuclear force. Since the early 1990's realistic models of the nuclear force are available, describing the NN data with high accuracy. Especially during the last years considerable progress has been made in deriving the nuclear force in the context of effective field theories. The next step is to apply those models in an environment where three (or four) nucleons interact with each other and thoroughly test underlying assumptions of nuclear physics. Successes and failures in the description of three nucleon scattering in the low energy regime will be illustrated in a few examples, and an alternative approach to the conventional state-of-the-art calculations, which are carried out in an a partial wave truncated basis, will be illustrated. As examples for this alternative formulation, which is not limited by partial wave truncations, elastic and break-up processes in the intermediate energy regime involving scalar particles are given. It can be expected that relativistic effects become important for a description of scattering observables at intermediate energies. An approach based on Poincar{\'e} invariant quantum mechanics will employed to study relativistic effects on elastic and break-up cross sections in leading order of the Faddeev multiple scattering series.
Back to the theory seminar page.