Abstract
The main objective of this research is to provide High Order Thinking Skills (HOTS) instrument assessment at elementary school. The development model used some phases: develop blueprint test, write the item test, verify the item test, tryout 1, analyses/ revision, tryout 2, analyze test result, and finalize the instrument. Analysis technique for content and construct validity using index Grogery formula at ≥ 0,75 index for relevancy (validity). For empirical validity Karl-Pearson correlation formula, and reliability using coefficient α (Cronbach Alpha). The research result shows that HOTS instrument assessment is valid and reliable, so that it can be used in teaching – learning activities to assess HOTS of the students at elementary school.