The purpose of the research was to find out the implementation of the indicators of critical thinking skills in the writing assignments of sixth-semester students in the English department. This analysis involved an in-depth understanding of writing structure, language choices, and students' ability to formulate arguments critically. The research proved useful for increasing knowledge about pedagogical writing and providing an in-depth analysis of students' writing assignments. This research was a quantitative descriptive analysis method research. The population of this research were all of the students in the Sixth semester of English Department UIN Sjech M. Djamil Djambek Bukittinggi year 2022/2023. According to the findings of the study, students showed inadequate critical thinking skills while creating 17 specific sub-indicators with scores below of 50%. It was found that students encountered difficulties when writing a thesis assignment. It means that the majority of students were unable to organize thoughts into thesis writing assignments.
