These lectures provide an introductory overview of the dynamics of flavour-changing transitions. The main emphasis is put on present tests of the quark-mixing matrix structure and the phenomenological determination of its parameters. The interplay of strong interactions in weak decays and the important role of flavour symmetries for controlling the size of QCD corrections to some semileptonic transitions are discussed.Comment: 54 pages, latex, 14 figures (included in a separate .uu file) Lectures given at the XXIII International Meeting on Fundamental Physics (Comillas, 22--26 May 1995). 1 reference correcte

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