  We consider $K_{l2}$ decays to the order $O(\alpha)$. We perform a matching
calculation, using a specific model with vector meson dominance in the long
distance part and the parton model in the short distance part. By considering
the dependence on the matching scale and on the hadronic parameters, and by
comparing with the leading model independent predictions, we scrutinize the
model dependence of the results.
