A testing term.
Most software needs to handle a range of numbers.
It is common practice to test that the software works with the most extreme data it needs to handle without error.
For example, if the allowed range of a variable is +10.00 to -10.00 then the normal range would be any number within + or - 9.99 The extreme data is + - 10.00 and the out of bounds data is + or - 10.001 where you may expect it to indicate an error message (perhaps).
Challenge see if you can find out one extra fact on this topic that we haven't already told you
Click on this link: Normal Data