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In several recent experiments involving motor performance (1), learning (7), immediate recall (2), expressive movement (5) and confidence in performance (3), significant relationships with a questionnaire measure of rigidity have been obtained. In view of the fact that despite a considerable amount of work no general trait of rigidity has hitherto been recognized, it was decided to clarify the reasons for the above results. Two steps are undertaken. The first step, published separately, is concerned with a systematic analysis of the experimental variables which yielded significant correlations with rigidity. In a series of investigations, the attempt is made to discover the experimental conditions necessary for a significant interaction of rigidity with test responses to occur.

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State Colony, Woodbine, N . J . Lower Penns Neck Public School, N . J .PROBLEM Considerable I& discrepancies in groups of retardates have been obtained between the Leiter International Performance Scale (LIPS), the Stanford Binet (SB) and the Wechsler Verbal (WAIS-V) and Performance (WAIS-P) scales (11 3, 5). In some experiments, Performance I& was superior, in others Verbal I&. Variation in intelligence level was thought to contribute significantly to these discrepancies. This study investigated differences between the above tests over a wide I& range. The following sources of variation are considered: test difficulty in terms of overall differentiation between tests; nature of test in terms of a Performance/Verbal test dimension; intelligence level in'terms of five grades maximally varying as to I&; and, finally, kind of intelligence level in terms of three level criteria varying along a Performance /Verbal dimension. METHODSubjects. Seventy-five retardates, who completed all tests, were drawn from the resident helper male population of Woodbine State Colony. The main selection criterion served to produce greatest possible I& variation.Tests. The tests selected are the LIPS, a pure performance scale; the SB (Form L), a mixed performance/verbal scale; the WAIS V and P subscales which are dealt with separately because of the differential effects between verbal and performance tests. The sample means, with standard deviations in brackets, are as follows: 61.69 (14.30), and WAIS Full Scale = 58.47 (10.56). They increase in the order LIPS -SB -WAIS, as expected from the literature. The correlations between the four test scores are as follows: LIPS us. SB = 0.77, us. WAIS-P = 0.78, and WAIS-V us. WAIS-P = 0.71. With one exception (LIPS us. WAIS-V), these coefficients are fairly uniform.For cross-validation of the Wechsler Performance /Verbal discrepancy effects, described in a separate paper(2), a score of WAIS-P minus V (P-V) was derived. The present mean is 1.67 (SD = 10.52).Chronological age. Age varied considerably about the mean of 36.91 years, SD being 11.88. Correlations between this factor and the test scores are as follows: LIPS = -0.12, SB = 0.00, WAIS-V = 0.13 and WAIS-P = 0.26. Only the latter coefficient is significant at the 5% level, indicating that age plays no significant role in the present analysis.Procedure. The tests were administered in a balanced order to control for sequence effects. The Binet and Wechsler tests were scored in the conventional manner. The scoring procedure for the LIPS was as suggested in a personal letter by Dr. R. G . Leiter: MA multiplied by 100 and divided by a constant of 156 with 5 I& points added (for Ss of more than 13 years). This procedure differs somewhat from that described in the manualc4).The criteria for the Performance/Verbal dimension were the LIPS, the rank order combined WAIS-V: LIPS and the WAIS-V score. The first and last score differ most with regard to both the Performance /Verbal dichotomy and intercorrelation. Variation in intelligence level was effect...