It's called concurrency, and what is happening in this program, because of the validity of the modelling initially and the initial testing that showed the validity of the modelling...there is a rationale for moving ahead and buying production aircraft at the same time that the test process is going on. This is very closely watched by the JSF program office and the program executive officer. On a daily basis he gets reports on the nature of the success of this process.
Because he is watching this so closely, that gives me great confidence that small errors would be found early and corrected before they become problems. While this is unprecedented, the nature of the modelling, the degree of computer design, and the success of the early testing give us great confidence that this process will succeed.