The development of mathematics higher order thinking skills instrument for grade VIII junior high school

21st-century learning activities require higher order thinking skills including critical and creative thinking. High-level mathematical thinking skills are tools to train and improve higher order thinking skills in mathematics. This study aimed to produce products in the form of a high level mathematical thinking skills instrument of grade VIII based on Bloom's Taxonomy containing C4 (Analyze), C5 (Evaluate), and C6 (Creating) questions. Indicators of higher order thinking include analyzing, organizing, differentiating, and linking. Evaluating is judging, checking and criticizing. While creating is generalizing, designing, and producing. This research was conducted at three junior high schools in Jakarta that consisted of 41, 36 and 36 students respectively. The sample of this research was grade VIII students. The study was conducted during the even semester in 2017. Data collection method used higher order thinking skill test of the eight grade students then analyzed data with the calculation of validity, reliability, difficulty level, and discrimination power. The result showed that the instrument was valid, reliable, the difficulty level was moderate, and the discrimination power was moderate so the problems in this instrument could be used by teachers to measure students’ high order thinking skills