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One of the educational problems is the quality of assessment and evaluation instruments. This study aims to develop two-tier multiple choice instruments to measure Higher Order Thinking Skills (HOTS) Bloomian in acid and base material. Bloomian's high order thinking skills consist of three aspects, they are analyzing, evaluating, and creating. The instrument consisted of two sets of tests, each containing 35 items including seven anchor questions that had been validated by two chemistry education experts and a measurement expert. The instrument was tested on 172 students spread across five high schools in the city of Yogyakarta. The results of the trials were analyzed and showed that as many as 63 questions fit with infit MNSQ 0.77 – 1.29. The level of difficulty in the test instrument ranges from -0.85 and 0.76. The instrument reliability is 0.71 which means it is included in the good category and qualified the requirements to measure high order thinking skills of high school students.

The Development of Two-Tier Multiple Choice Instruments to Measure Higher Order Thinking Skills Bloomian