Paxboy has got it right. When you outsource anything, make sure that you have in-house the capability to specify and check what the outsourcer is up to.
One Engineering Co that I used to work for then added up the costs of the proper supervision of outsourcers that it did - and decided that for any Novel design, it would do all the detailed spec and design in house, thereby equipping it with the capability to specify and check what the outsourced producer was up to.......