Topic > this is sensitivity. Specificity means that when we measure "A" with our test, we know that the test does not measure "B", "C", or "D". Clinical neuropsychologists evaluate patients using one of three general methods. The first method is to use an evaluation technique where you are given a fixed set of tests and where you just want to know which functions are impaired and which functions are not impaired. The most commonly used representative of this type of test is the Halstead - Reitan Neuropsychological Battery. The second method is to use an assessment technique where a fixed battery of tests is given, but in this method there is a hierarchy for each subtest so that if a function is impaired, the level at which it is impaired can be determined. The most common representative of this type of test is Luria - Nebraska. Common to both of these tests is a long history of research studies examining the two batteries' ability to measure brain dysfunction and precisely identify why that dysfunction occurs. The third method used by neuropsychologists is the flexible battery approach. By definition, the flexible approach is not a battery because when using this approach you provide a group of tests presumably selected only for a particular patient. This means that the particular test group is not administered to other patients and is not