  I shortly review the present status of the theoretical calculations of
eps'/eps and the comparison with the present experimental results. I discuss
the role of higher order chiral corrections and in general of non-factorizable
contributions for the explanation of the Delta I = 1/2 selection rule and
direct CP violation in kaon decays. Still lacking satisfactory lattice
calculations, analytic methods and phenomenological approaches are helpful in
understanding correlations among theoretical effects and experimental data.
Substantial progress from lattice QCD is expected in the coming years.
