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The purpose of this study was to analyze the quality of the National Association of Industrial Technology (NAIT) certification examination quality control section, which contains forty items, using the methodologies of classical test theory (CTT) and item response theory (IRT). The ultimate goal of this research project is to evaluate the quality control portion of the NAIT certification exam by analyzing the questions or items. The project goal through this analysis was to identify the item problems and make recommendations to correct them. The following conclusions were made based on a sample of 996 examinees: 1. The test is still being developed. a. The tests validity needs to be evaluated. b. Items need to be defined with the requirement for unidimensionality. 2. Using classical test methodology, the test's reliability was originally .59. a. It was improved to .74 by eliminating poor item discrimination questions. 3. Item response theory methodology revealed item characteristics that included: a. Only a subset of items contributed to total test information results. b. Item discrimination was considered acceptable for approximately half of the items. 4. The examinee ability ratings mean was -0.0147 with a standard deviation of 1.15. a. The correlation between examinee scores and their ability rating was .92. 5. The test was found to be unidimensional after removing the poor discriminating items.

The National Association of Industrial Technology certification exam: quality control assessment using item response theory and classical test theory methodologies