In the present talk we briefly discuss the most general form of QCD Factorization, which we call Basic Factorization, and show how it is related to the conventional forms of factorization: K_T-Factorization and Collinear Factorization. When Basic Factorization is applied to hadronic scattering amplitudes, integration over momenta of the partons connecting perturbative and non-perturbative blobs runs over the whole phase space but result of the integration must be finite. This obvious requirement allows us to obtain theoretical restrictions on the fits for the involved non-perturbative contributions. In order to model non-perturbative contributions in Basic Factorization, we suggest the Resonance Model which can universally be used to describe hadronic reactions with unpolarized or polarized hadrons.
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