Psychometric properties. The psychometric properties of the MMPl and MMPI- 2 are comparable(M. F. Gaston et al., 1994). the newer version maintains strong continuity with the original. For example, the factor structures of the new and original versions are quite similar. Median split-half reliability coefficients for both the original MMPI and the MMPI-2 run in the .70s, with some coefficients as high as .96 but others much lower Median test-retest coefficients range from the low .50s to the low .90s (median .80s). Although these coefficients are not as solid as those for the major ability tests, such as the Binet and Wechsler, they are as high as or better than those reported in comparable tests. Moreover, when one looks at the basic