This is an announcement for the paper "A criterion of weak compactness for operators on subspaces of Orlicz spaces" by Pascal Lefevre, Daniel Li, Herve Queffelec, and Luis Rodriguez-Piazzaa. Abstract: To appear in J. Funct. Spaces and Appl. Archive classification: math.FA Mathematics Subject Classification: 46E30 Remarks: 18 pages The source file(s), critere.tex: 40456 bytes, is(are) stored in gzipped form as 0806.4204.gz with size 13kb. The corresponding postcript file has gzipped size 97kb. Submitted from: lefevre@euler.univ-artois.fr The paper may be downloaded from the archive by web browser from URL http://front.math.ucdavis.edu/0806.4204 or http://arXiv.org/abs/0806.4204 or by email in unzipped form by transmitting an empty message with subject line uget 0806.4204 or in gzipped form by using subject line get 0806.4204 to: math@arXiv.org.