Steve Lack's sharp eyes detected a kind of subtle error in Theorem 4.2 of my recently announced paper with A. Pultr on "Free Quillen Factorization Systems". I have posted a corrected version of the paper on my homepage http://www.math.yorku.ca/Who/Faculty/Tholen/research.html. Regards, Walter Tholen. 25-Aug-2002 12:43:46 -0300,2541;000000000000-00000000