Again, the elements you look at are the kinds of missions you expect—the study looked at the different missions that have to be carried out—and that ends up creating some of the performance specifications an aircraft would have to meet to complete that mission. Ultimately, when the missions are put together, you end up with your statement of requirements.
The point that was made earlier is that this may or may not be able to be fulfilled by one aircraft. It depends on the aircraft, how much money you've got, etc.