  A review of the present experimental status of the rates and the Dalitz-plot
slope parameters in CP conserving K->2\pi and K->3\pi decays is given. The
corresponding isospin amplitudes have been determined by a common fit to the
recent experimental data and have been used as an input to a consequent fit
based on the constraints from O(p^4) chiral lagrangian. It has been found that
the constraints of the chiral fit are well satisfied by the experimental data,
allowing to estimate the weak coupling constants and to predict the quadratic
amplitudes in K->3\pi decays and the one-loop strong rescattering phases. The
consistency of the obtained weak coupling constants with weak resonance models
has been also considered.
