>>>>> "Tobias" == Tobias Kunze <tkunze@cmsgia.Stanford.EDU> writes: Tobias> For some reason, clisp doesn't seem to let you redefine a Tobias> class once it's defined CLISP's CLOS doesn't support class redefinition (UPDATE-INSTANCE-FOR-REDEFINED-CLASS, etc). Perhaps you could use PCL for development...