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This research aims to describe the quality of critical thinking skill test of fluid mechanics material in senior high schools in Makassar City. The emphasis is the content validity aspect, the characteristics of each item for the One-Parameter Logistic (1PL) model, the Two-Parameter Logistic (2PL) model, dan the Three-Parameter Logistic (3PL) model. It is a descriptive quantitative research with the subject of all student responses to the critical thinking skills test of fluid mechanics material at senior high schools in Makassar City. There were 726 student responses. The data were collected online by google form and analyzed by using descriptive quantitative technique. The results showed that the critical thinking skill test of fluid mechanics material had fulfilled the content validity. Analysis of the quality of CTS test items showed that the models of 1PL, 2PL, and 3PL were all consistent, showing that the test items were mostly able to discriminate the high abilitytestees from the low abilitytestees. Of the three logistic model approaches used to estimate the parameters of item difficulty level, item discrimination, and guess factor, the 3PL model is better than the other twomodels.
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