  We present a method for the analysis of singularities of Feynman amplitudes
based on the Speer sector decomposition of the Schwinger parametric integrals
combined with the Mellin-Barnes transform. The sector decomposition method is
described in some details. We suggest the idea of applying the method to the
analysis of collinear singularities in inclusive QCD cross sections in the
mass-less limit regularizing the forward amplitudes by an off-shell choice of
the initial particle momenta. It is shown how the suggested strategy works in
the well known case of the one loop corrections to Deep Inelastic Scattering.
