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By using HOTS in learning, the information obtained will be documented in memory longer than using LOTS. HOTS can be trained to students through several learning models including Problem-Based Learning (PBL). PBL is a problem-based learning model and can be chosen by mathematics teachers as the best solution to develop students' low problem solving, reasoning, critical thinking and creative abilities. The junior high school (SMP) education level is an important stage in mathematics education, where students begin to learn more complex mathematical concepts. One of the essential concepts is relationship and function. The aim of this research is to describe the high-level thinking abilities of class VIII students in solving problems related to the concepts of relationships and functions after being given learning using the Problem-Based Learning model. This research uses qualitative research methods with a descriptive approach. The research subjects were class VIII students who had studied relationship and function material with PBL. Data collection techniques were carried out by giving written tests at the level of analyzing, evaluating and creating based on Bloom's taxonomy and interviews. The research results show that not all stages of the high-level thinking process appear simultaneously in problem solving carried out by students for each indicator of high-level thinking.
Apipah et al. (Sun,) studied this question.