2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/196006I describe recent advances in our understanding of the hadronic form factors governing semileptonic meson transitions. The resulting framework provides a systematic approach to the experimental data, as a means of extracting precision observables, testing nonperturbative field-theory methods, and probing a poorly understood limit of QCD.13 pages, 9 figures. Invited talk presented at Flavor Physics and CP Violation Conference, Vancouver, 2006; figure 9 updated with new experimental data, references addedHigh Energy Physics - PhenomenologyHigh Energy Physics - Experimenttext