2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/43956The experimental status and theoretical uncertainties of the Cabibbo--Kobayashi--Maskawa (CKM) matrix describing the charge-changing weak transitions between quarks with charges -1/3 ($d, s, b$) and 2/3 ($u, c, t$) are reviewed. Some recent methods of obtaining phases of CKM elements are described.10 pages, 7 figures, presented at 5th Rencontres du Vietnam, Hanoi, August 6-11, 2004. References added and some corrections madeHigh Energy Physics - Phenomenologytext