Many additions and changes to the measure have been made over time to improve interpretability of the original Clinical Scales. The most historically significant developmental changes include: Additionally, there have been changes in the number of items in the measure, and other adjustments which reflect its current use as a tool towards modern psychopathy and personality disorders. In 1989, the MMPI became the MMPI-2 as a result of a restandardization project to develop a new set of normative data representing current population characteristics the restandardization increased the size of the normative database to include a wide range of clinical and non-clinical samples psychometric characteristics of the Clinical Scales were not addressed at that time.
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