A revision of the results published in the foreign literature about the incremental validily of the MMPI-2 is done. These results are contrasted with the evidence gathered in Chile in the standardization and validation process of the MMPI-2. The MMPI-2 maintains unaltered its internal structure with respect to the functioning of the traditional validity and clinical scales, so allowing a smooth transition from the MMPI to the MMPI-2. With respect to the incremental contribution of the new MMIP1-2 content scales, the results are promising, allhough not yet conclusive. It is expected that new studies will contribute with further evidence, in order to answer this crucial question.