Some more fixes have been committed to r-devel, again with the aim of making S4 classes, including non-exported classes, work with namespaces. (This is inevitably an iterative process of finding examples where only the class name, without the relevant package/environment, is passed down.) John -- John M. Chambers jmc@bell-labs.com Bell Labs, Lucent Technologies office: (908)582-2681 700 Mountain Avenue, Room 2C-282 fax: (908)582-3340 Murray Hill, NJ 07974 web: http://www.cs.bell-labs.com/~jmc