A
Uh-huh.
B
You know, when you write a test you have to look at some data from it and see how the different questions are performing --
A
Uh-huh.
B
-- and find out which ones are discriminating well and which ones aren't --
A
Uh-huh.
B
-- find out how reliable the test is, you try correlate it with other tests and things of that sort. So it's, involves a lot of spreadsheet use.