Russell, E. W., & Russell, S. L. K. (2002, October 13). The psychometric status of the flexible battery. Paper presented at the Coalition of Clinical Practitioners in Neuropsychology, Miami, FL.
Neuropsychological assessment produces reliable knowledge if, and only if, it has been validated using accepted psychometric methods. The flexible battery has never been validated as a battery. Due to the probability that some tests will be impaired by chance, a flexible battery can not produce reliable interpretations from individual or combined test results. Localization and diagnostic assessments are obtained by comparisons which require that the tests are invariant or have equivalent norms along with a common metric. Flexible batteries are not invariant and the equivalency of their norms has never been demonstrated so they can not provide reliable comparisons. Clinical judgment using a flexible battery approach has not been validated in any respect, consequently, it can not provide reliable knowledge. In conclusion, a flexible neuropsychological battery approach can not provide any reliable information, interpretations or forensic evidence beyond that which could be obtained from a validated individual test.Request from the authors