The differencing algorithm compares elements at each level of a lifecycle with those at the same level and the same name. Where elements have been renamed, they show up as an addition on each side. For example, if one lifecycle contains a state named "Test" and the other contains a similar state named "Testing", you will initially see two states in the tree, one marked as left-only and the other as right-only. The two states can be aligned so that they can be compared. To do this, right-click on one of the elements you wish to align and select Align With.... In the dialog that opens, select the element that you want to align with (only elements at the same level are shown, and in the case of processes, only processes of the same type are shown). The lifecycles will be re-compared and the tree-view will now show a single element containing both names seperated by a slash. For our states example, this would be "Test / Testing".