AbstractTextbook as a source of learning enables students to practice and develop their thinking ability through exercises which are designed in a different level of thinking. This research aims to analyse the most frequent thinking skills in WH-Questions and to examine the extent to which the WH-questions emphasize high-level thinking. This research uses a descriptive quantitative research. The writer first collects the WH-questions taken from an English textbook entitled “Buku Bahasa Inggris Kelas X”, then classifies the data based on its level of thinking. This research uses Bloom’s Taxonomy revised by Anderson & Krathwol. The finding shows that the most frequent thinking skill is remembering with 49.65%, the understanding level is 24.13%, applying level is 1.39%, analysing is 17.94%, evaluating is 6.89%, and creating is 0%. Based on the result, the researcher concludes that the book which is issued by the Ministry of Education focuses on the lower level of thinking skills. This research is expected to give contribution in textbook evaluation.Keywords: textbook, thinking skills, content analysis
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