Our DCC maintains a master index of all controlled documents such as our Quality Manual, processes, forms, and work instructions. All of these are indexed by document numbers, we also list on that matrix documents we need from our customers such as their quality manuals and standards. This is what we are using as our control of documents, would this also then be the best place to control engineering specs? The problem I see with that would be the layers engineering would have to go through for changes.