While the testability of a requirement is fundamental to the concept of sizing with testable requirements, it should be noted that sizing a system using testable requirements is not the same as counting test cases. The number of testable requirements may be very different from the number of test cases. There are a number of reasons for this:
![](Symb075c00b700f000000000.png) A testable requirement may require more than one test case to validate it.
![](Symb075c00b700f000000000.png) Not all testable requirements will have associated test cases. (Most systems test less than half the testable requirements.)
![](Symb075c00b700f000000000.png) Some test cases may be designed to validate more than one testable requirement.
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