  A comparison of the linear sigma model (L$\sigma$M) and Chiral Perturbation
Theory (ChPT) predictions for pion and kaon dynamics is presented. Lowest and
next-to-leading order terms in the ChPT amplitudes are reproduced if one
restricts to scalar resonance exchange. Some low energy constants of the order
$p^4$ ChPT Lagrangian are fixed in terms of scalar meson masses. Present values
of these low energy constants are compatible with the L$\sigma$M dynamics. We
conclude that more accurate values would be most useful either to falsify the
L$\sigma$M or to show its capability to shed some light on the controversial
scalar physics.
