http://www.informatik.tu-cottbus.de/~thalheim/HERM.htm Entity-Relationship Modeling Foundations of Database Technology by Bernhard Thalheim
http://www.informatik.tu-cottbus.de/~thalheim/HERM/hermdiscussion/HERMdiscussion.html Are there arguments against ER models and their extensions 也討論 UML
http://c2.com/cgi/wiki?ModernDinosaur UML: A Modern Dinosaur? - A Critical Analysis of the Unified Modelling Language