basically, you cant test for T vs. F, then test for J vs. P, and then determine if T or F is introverted or extroverted.
example questions:
"Determine success by measurement or other objective method such as the time taken."
1) yes
2) no
say a T would answer 1, okay?
"You believe the best decision is one that can be easily changed"
1) yes
2) no
say a J would answer 2
so the person got points for xxTJ, right? that means they get points for Te, right? but if the person answered the second question 1, they'd get points for xxTP, which means they'd get points for Ti, yes?
but the first question is a Ti question, not a Te one. that means that one out of two people will be scored incorrectly.
maybe those weren't the best example questions, but you see my point i hope.