A theory describing baryon beta-decay processes, according to which the amplitude for such processes is given by G {cos θ [V (Δs = 0) + A (Δs = 0)] + sin θ [V (Δs = +1) + A (Δs = +1)]}, where θ is the Cabibbo angle, Δs is the change in strangeness for the baryon, G is a universal beta-decay amplitude, and V and A are vector and axial vector amplitudes, respectively; it is experimentally determined that sin θ ≈ 0.25, so that cos θ = 0.97.