2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/106824We test the accuracy of the ALI method, widely used in stellar atmosphere modelling, by solving exactly a standard radiative transfer problem in plane-parallel geometry. Some recommendations are given for a practical use of this method.4 pages, 4 figures, abstracts SF2A-2003, published in EDP-Sciences Conference SeriesAstrophysicstext