<![CDATA[Higher Order Thinking Skills (HOTS) are important competencies in 21st century learning, especially in chemistry that is conceptual and analytical. HOTS includes three levels of the revised Bloom's Taxonomy: analyzing (C4), evaluating (C5), and creating (C6), with creating as the highest level that demands creativity and original solutions. Acid-base material in grade XI is often considered abstract and difficult to understand, so an evaluation instrument is needed that can measure HOTS in a valid and reliable manner. This study aims to develop an electronic-based descriptive test instrument to measure students' HOTS. The development model is modified from the Wilson, Oriondo, and Antonio model, through three stages: design, limited testing, and measurement. The validation results by material experts (91%), construct (90%), and language (89%) show a very high category. The reliability test produced a coefficient of 0.87, indicating very good consistency. The discriminatory power of the questions is mostly good with a moderate level of difficulty. Teachers' assessment of the instrument's feasibility was 92%, and students' responses were 88%, both of which were categorized as very good. Thus, this instrument is suitable for measuring and improving students' HOTS in acid-base learning according to the Merdeka Curriculum.]]>
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