An attempt was made to determine whether reliable demographic and behavioral correlates could be found for single scale Minnesota Multiphasic Personality Inventory (MMPI) code types. Utilizing a split-sample technique to allow for replication, high-point, low-point, high-score, and low-score code types were studied. Each code type was compared with other subjects on 73 demographic and behavioral variables. Separate analyses were done for male and female code types. Only correlates reliable across both samples are reported. A sufficiently large number of reliable correlates were identified to suggest that single-scale code types can be considered a meaningful approach to MMPI interpretation. The importance of using replication procedures was confirmed.In response to the plea for a "good cookbook" for psychological test interpretation (Meehl, 1956), a number of investigators have attempted to identify empirical correlates of various types of MMPI profiles. In the earliest studies profiles were classified according to relatively simple criteria, such as high scores or low scores on a single scale