  We discuss recent results on the Seyfert spectral variability. Their observed
high energy variability is generally consistent with X-ray spectral slop
fluctuations produced by change of the soft photon luminosity in the sense that
spectra soften when the UV flux increases. These behaviors strongly favor a
thermal origin for the X-ray emission in these objects. We present the case of
NGC 7469, showing the results of the reanalysis of the simultaneous IUE/XTE
observations of this object using a realistic thermal Comptonization model to
fit the continuum instead of the simple power law approximation adopted in the
past.
