“…QCD dressing, in the regime of scales > 1 GeV 2 , for which perturbative QCD can be sensibly employed, contribute a factor of 3 − 4 to the enhancement [1,2], while, in the case of non-leptonic K decay, long-distance effects, including those of final state interactions (FSI) [3][4][5] also contribute significantly. Attempts to provide a sensible matching of short and long distance effects in a single theoretical framework now appear likely to account for the full observed enhancement [3,[6][7][8]. The neglect of isospin breaking (IB), however, represents a potential problem for this putative understanding [9].…”