I'll begin by saying that, at the general level, departments will have identified that they do not have the in-house skills they require, so they will look to have an external piece.
Under these instruments, they are looking for IT professionals with certain skills, and the competitive mechanism is open to firms that are structured like GC Strategies, as well as other firms that are integrated firms that would have IT professionals with a range of skills. They normally compete, and whoever ends up having the most skilled team at the best price would win the contract.