Sorry, this is slightly off topic, but just had to share this SPOT-ON description of Zope's undo functionality from the author of our custom CMF tutorial: This function should be used sparingly. A full actions history is kept and any mistake can be undone. Once a mistake is realised that cannot be undone by fixing it in the edit box, click Undo. The actions history's latest entries are at the top of the list, so if the mistake was made and it was realised immediately, that entry should still be at the top of the list, and the description next to it should give a reasonable indication as to whether this was the offending action. Simply tick its box and click Undo, and that entry will be reversed as if it had never happened. "Undo's" can also be undone, and the undo of an undo can be undone as well, so every Undo that is performed appears at the top of the Undo list, and can again be undone. In fact, it can get so confusing that it becomes one's undoing... That is why this function should be used sparingly!