It looks like zope.container.contained.notifyContainerModified is the event that is sent when *any* container modification occurs. Maybe this is too coarse grain? I would like to be able to differentiate when Ordering changes take place on a container. Are there any complaints against having ordering signal a more specific event? i.e. ContainerOrderModifiedEvent? It would inherient from ContainerModifiedEvent. specifically in: - zope.container.ordered.updateOrder - OFS.Folder.OrderSupport The problem is that it is very difficult to know if the Order has changed vs. some other container attribute has been changed. -- Alan Runyan Enfold Systems, Inc. http://www.enfoldsystems.com/ phone: +1.713.942.2377x111 fax: +1.832.201.8856