We are revising our text, "Category Theory for Computing Science", for its second edition. We would appreciate any comments or suggestions concerning this revision, including papers and books we should refer to, new topics we should include, and topics we could delete. Please reply to either of us. Michael Barr Charles Wells barr@triples.math.mcgill.ca cfw2@po.cwru.edu -- Charles Wells, Department of Mathematics, Case Western Reserve University 10900 Euclid Avenue, Cleveland OH 44106-7058, USA Phone 216 368 2880 or 216 774 1926 FAX 216 368 5163