I'm currently re-reading all the material about model/view architecture in QT to figure out how best to approach the synchronization of two views which have two underlying models (one tree, one string list), and where the synchronization code should live (in the code for the dialog box holding the view controls, or in the HcmcImtDoc class). An added complication is that the QSortFilterProxyModel which is currently filtering the list view by regexp currently lives in the dialog box code, but I think it should almost certainly move to the HcmcImtDoc class.