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This article surveys the important questions attached to unitarity tests ofthe Cabibbo-Kobayashi-Maskawa matrix, with a focus on the direct determinationsof the magnitude of CKM matrix elements. The current CKM anomalies arediscussed and the clear-cut prospects at LHCb and Belle II envisaged. Theanticipated precision on $C\!P$-conserving and $C\!P$-violating observables atthe projected upgrades of the LHCb and Belle~II experiments is examined fromthe point of view of the search for New Physics in $B$-meson mixing, addressingthe bottlenecks in precision for the interpretation of the measurements forfuture experiments and highlighting the related theoretical and experimentalchallenges. The vibrant prospects at future $e^+e^-$ colliders running at the$Z^0$ pole and $W^+W^-$ are eventually discussed.

High precision in CKM unitarity tests in $b$ and $c$ decays