2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/4378We review recent progress on the modeling and use of reflection spectra from irradiated and ionized accretion discs. On the computational side, calculations of reflection spectra from discs with non-uniform density structure have shown that thermal instabilities can effect the predictions. Ionized reflection spectra have been used effectively in fitting data of Narrow-Line Seyfert 1 galaxies, and have placed constraints on the strength and shape of soft X-ray emission lines.4 pages, 4 figs. To appear in 'X-ray Spectroscopy of AGN with Chandra and XMM-Newton', held in Garching, December 3-6, 2001, eds. Th. Boller et alAstrophysicstext