In previous version, you export Revit model to nwc file and open it in Navisworks to do the clash detect. Once you find the interferenced elements in Navisworks, generally, you will check the element ID, and then go back to Revit, and use Select By ID function to find the element, it is very time consuming, and sometimes, you can’t find the correct element with the ID.
Now in Revit 2012, it is much easier.