The evaluation of critical thinking, as with any other measure, must employ instruments that meet appropriate psychometric standards. Therefore, the purpose of this study was to investigate the psychometricproperties of the two California Critical Thinking Tests. Two samples of undergraduate students enrolled in a southern comprehensive university took the California Critical Thinking Skills Test (TST) and the California Critical Thinking Dispositions Inventory (TDI). A portion of the participants, who were nursing students, were retested on the TST and TDI two weeks after the initial testing. Some participants also completed the Watson-Glaser Critical Thinking Appraisal (WGCTA). In both samples the TST had neither sufficient psychometric properties to assess individual abilities nor sufficient stability reliability. In particular, the analysis subscale of the TST demonstrated exceptional weakness in all administrations. In contrast, the TDI demonstrated very good reliability estimates in all administrations of the test. The data did not conform to the subscale structure during factor analysis. Whereas the TST needs further refinement, the TDI demonstrated sufficient reliability for use in attitudinal research.

This research addressed the need for a clinically practical and psychometrically sound measure of a central construct of Occupational Adaptation theory. As an indicator of Occupational Adaptation, the Relative Mastery Measurement Scale (RMMS) was developed and evaluated for content and construct validity. The RMMS assesses individuals' perceptions of their effectiveness, efficiency, and satisfaction regarding their responses to occupational challenges. In the first phase, the content validity of the RMMS was statistically evaluated using the ratings of five experts in Occupational Adaptation. Lu's Coefficient of Agreement among the experts for the final 12-item RMMS was an acceptable .95. In phase two, construct validity and reliability were examined using a combination of Rasch analysis and traditional measurement statistics. Participants were 150 rehabilitation clients. Reliability and validity was supported through the unidimensionality of 11 of 12 RMMS items by the ordering of item difficulty, goodness-offit statistics, factor analysis, and point-biserial correlations.

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