  A brief survey of applications of chiral perturbation theory to both
semileptonic and nonleptonic kaon decays is presented. Special emphasis is
given to recent theoretical advances related to semileptonic decays, in
particular pion pion scattering and Ke4 decays. The systematic approach for
including isospin violation and electromagnetic corrections in semileptonic
decays is discussed for Kl3 decays.
