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A formalism is presented to evaluate the Sivers function in constituent quarkmodels. A non-relativistic reduction of the scheme is performed and applied tothe Isgur-Karl model. The results obtained are consistent with a sizable Siverseffect and the signs for the u and d flavor contributions turn out to beopposite. The Burkardt Sum Rule is fulfilled to a large extent. After theestimate of the QCD evolution of the results from the momentum scale of themodel to the experimental one, a reasonable agreement with the available datais obtained. A calculation of nuclear effects in the extraction of neutronsingle spin asymmetries in semi-inclusive deep inelastic scattering off 3He isalso described. In the kinematics of forth-coming experiments at JLab, it isfound that the nuclear effects arising within an Impulse Approximation approachare under control.

Sivers Asymmetry for the proton and the neutron