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We present a strategy designed to separate several possible origins of thewell-known enhancement of the Delta{I}=1/2 amplitude in non-leptonic kaondecays. In particular, we seek to disentangle the contribution of physics atthe typical QCD scale (soft-gluon exchange) from the effects at the scale ofthe charm quark mass. This is achieved by considering QCD with an unphysicallylight charm quark, so that the theory possesses an approximate SU(4)_L xSU(4)_R chiral symmetry. By computing the relevant operator matrix elements andmonitoring their values as the charm quark mass departs from theSU(4)-symmetric situation, the role of the charm quark can be assessed. Westudy the influence of the charm quark mass in Chiral Perturbation Theory.First results from lattice simulations in the SU(4)-symmetric limit are alsodiscussed.Comment: Latex, 41 pages, 5 figure

A strategy to study the role of the charm quark in explaining the Delta{I}=1/2 rule