The article by S. B. G. Eysenck, H. J. Eysenck, and Paul Barrett addresses the psychometric deficiencies of the original Psychoticism scale, particularly its low reliability, narrow scoring range, and skewed distribution. To improve these issues, they conducted two studies using a 90-item questionnaire and a 117-item questionnaire, respectively, to add new items and enhance the scale's internal reliability, distribution, and mean scores. The new scale, named the EPQ-R, includes 32 items for the P scale, with slight changes to the E and N scales. The results show improved reliability (0.78 for males and 0.76 for females) and a more normal distribution, with higher mean scores compared to the original scale. Four new short 12-item scales for measuring P, E, N, and L are also provided. The authors conclude that these improvements address the psychometric shortcomings of the original scale, enhancing its utility in future research.The article by S. B. G. Eysenck, H. J. Eysenck, and Paul Barrett addresses the psychometric deficiencies of the original Psychoticism scale, particularly its low reliability, narrow scoring range, and skewed distribution. To improve these issues, they conducted two studies using a 90-item questionnaire and a 117-item questionnaire, respectively, to add new items and enhance the scale's internal reliability, distribution, and mean scores. The new scale, named the EPQ-R, includes 32 items for the P scale, with slight changes to the E and N scales. The results show improved reliability (0.78 for males and 0.76 for females) and a more normal distribution, with higher mean scores compared to the original scale. Four new short 12-item scales for measuring P, E, N, and L are also provided. The authors conclude that these improvements address the psychometric shortcomings of the original scale, enhancing its utility in future research.