2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/44136We review the theory of the determination of the CKM elements Vcb and Vub. Particular attention is paid to the determination of Vcb through inclusive semileptonic B decays to charm using a moment analysis, since this has shown most progress recently. A precise method for the determination of Vub via exclusive decays is described.Talk presented at FPCP04, submitted as proceedings; 10 pages, 4 figuresHigh Energy Physics - Phenomenologytext