One of the solutions is to bring as much in house as possible. We don't have to rely on adding more to contracts if we have the in-house services.
One of the things, especially when looking at contracts, is that big corporations look at the contracts and look for voids. They look for what you haven't put in the contract. They know when they put their bid in that you haven't specified that, and they will go after those extra charges. It is known. They actually have people who comb through government contracts to find those loopholes.