These notes provide a pedagogical introduction to the theory of non-leptonic heavymeson decays recently proposed by Beneke, Buchalla, Sachrajda and myself. We provide a rigorous basis for factorization for a large class of non-leptonic two-body B-meson decays in the heavy-quark limit. The resulting factorization formula incorporates elements of the naive factorization approach and the hard-scattering approach, and allows us to compute systematically radiative ("non-factorizable") corrections to

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... naive factorization for decays such as B → Dπ and B → ππ.