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This study aims to test the reliability and items characteristics of the essay test instrument to measure the higher-order thinking skills of social science lessons of junior high school grade 8. This research is useful to know the characteristics of the instrument items used directly by teachers for measurement activities in learning. This research method using quantitative research techniques. The sample used for the test used 105 students taken at random. The result of the research shows the estimation of instrument reliability coefficient of 0.819. The grain characteristics test of the difficulty level parameter for 15 items consists of eight items in the Easy category, 6 items in Medium category and one item in difficult category. Grain characteristics test for different power parameters found three items that are not able to distinguish the ability of students. The conclusion of this research is reliable instrument to measure the ability of high-level thinking and 12 items can be able to distinguish students' thinking ability. Teachers can use instruments consisting of 12 items to measure high-order

Characteristic Analysis of Essay Test Instruments for Measuring Higher-Order Thinking Skills