I think that it may be a good idea to put the extra time into thinking about the specifications of a critical component. Yes you want them to be as specific as possible, but if you know during design specification that you will need to dual source a specific component for your product, maybe it would be a good idea to do some research on what specs are available from the suppliers before making a concrete spec so that you don’t have to return to design controls to change the spec once you’re near project completion. This is also where experience and superior planning skills make a huge impact.