From: Trans Date: 2005-09-29T20:41:46+09:00 Subject: Re: Concerning persistency techniques %Q{ However one problem is that that all the class-types that could be saved have to be known by this > object manager. This results into the following code: } I don't see how the code follows. You have what I call "require_all" defined, thus requiring every file in a directory. Don't see how that relates to ObjectManager knowing the classes. Or do you just mean that the classes must already be defined upon loading the stored objects? T.