Development of Higher-Order Thinking Skills (HOTS) Questions of Probability Theory Subject Based on Bloom's Taxonomy

This research aims at producing assessment instruments of Mathematics in the form of HOTS questions of Probability Theory subject based Bloom's Taxonomy. Research Design used is Research and Development. This research refers to the Tessmer progressing model which consists of two phases: a preliminary and formative evaluation. The questions are improved based on their validity, practicality, and effectiveness. The prototype I question as the beginning design is validated by 3 experts (expert review) and stated that 20 questions are valid with score 4.3. One-to-one check obtains that questions no. 10 and no. 13 need to be revised. The result of Prototyping phase revision is called Prototype II. In small group phase, Prototype II is tested on 5 students. The result shows that the readability level of the questions has met the element of readability very well about 88%. Practicality test of the questions obtained from the correct answers of the students is 88.3%. Considering the range of practicality criteria, the questions can be applied without revision. Effectiveness test of HOTS questions is implemented on field test. The average score on the higher-order thinking skill of the two classes is 86.22. Counted from the completeness of the learning process of the students proportion, the score above 70 obtained is 82.25. There are 51 of 62 student's obtain score higher than 70. It means that the HOTS score of the students is at a good level. The 20 HOTS questions of Prototype III is rated Good and become the final questions without revision developed based on Tessmer.