I am thinking of establishing a modules mailing list, and account where a bibliography of articles on modules (as apparently first defined by Jon Beck, unless it was folklore before that) could be found. If anyone is interested in being on such a mailing list, please send mail to rowan@garnet.berkeley.edu along with any comments. Best regards, Bill Rowan ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++