2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/12968This article describes the various photometric techniques currently being used, including some preliminary results from the large CNOC2 redshift survey. It also presents a critical look at the reliability of the photometric redshift technique, in part using the HDF results from various groups as a case study.11 pages, Latex, 3 postscript figures. A review article to appear in the proceedings of the Xth Recontres de Blois: Birth of Galaxies; Blois, France, July 1998Astrophysicstext