2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/48832The perturbative QCD formalism for exclusive heavy meson decays, especially the three-scale factorization theorem for nonleptonic modes is reviewed and compared to the conventional Bauer-Stech-Wirbel model.5 pages in REVTEX, talk presented at DPF99, UCLA, 1999High Energy Physics - Phenomenologytext