  Some estimates for the transverse single spin asymmetry, A_N, in the
inclusive processes l p(transv. pol.) -> h X are compared with new experimental
data. The calculations are based on the Sivers and Collins functions as
extracted from SIDIS azimuthal asymmetries, within a transverse momentum
dependent factorization approach. The values of A_N thus obtained agree in sign
and shape with the data. Predictions for future experiments are also given.
