This research has been done to develop an instrument for measuring junior high school students’ physics
higher order thinking skills (PhysETHOTSS) and to obtain the characteristics of the PhysETHOTS. The
instrument blue print has been developed based on the aspects and sub-aspects of higher order thinking
skills, then it was used to develop the items. The instrument consisting of 24 items were validated by
physics educational measurement experts. The validated instrument was tried out on students of junior
high school (SMPN 1 Sewon). The polytomous data were analyzed according to the partial credit model
(PCM). The results show that the 24 items of PhysETHOTS were fit to the PCM, the reliability of the test
was 0.75, the items’ difficulty indexes ranged from -1.22 to 0.34. Therefore, the PhysETHOTS is
qualified for the measurement of junior high school students’ physics higher order thinking skills
