Vol. 4, No. 2; October 2020 E-ISSN 2579-7484 Pages 163-176 163 The Compatibility between Philosophical Foundation of „English in Mind‟ Textbook and Curriculum 2013 Ida Megawati 1 , Darmiyati Zuchdi 2 Universitas Sarjanawiyata Tamansiswa 1 , Indonesia, Universitas Negeri Yogyakarta 2 , Indonesia Correspondence: Ida Megawati, Universitas Sarjanawiyata Tamansiswa, Indonesia. e-mail: ida.megawati@ustjogja.ac.id Submitted: September 11, 2020 Revised: September 11, 2020 Accepted: October 01, 2020 DOI: 10.29408/veles.v4i2.2555 URL: http://dx.doi.org/10.29408/veles. v4i2.2555 Abstract A textbook should reflect a curriculum being applied. The compability of the philosophical foundation between the curriculum and textbook is needed to achieve the educational goals. This study aims to find the philosophical foundation of the English in Mind Students' Book and the compability of the philosophical foundation between the curriculum and the textbook. This study is an inferential content analysis. The object is the English in Mind Students' Book. The procedure is the data making; physical and referential units, sampling; six chapters, data recording, data reduction, and withdrawal of inference. This study used semantic validity and test-retest reliability. This study used analytic constructs as a reference for the meaning of data to be analyzed using conceptual domain analysis techniques. Based on data analysis, there are six philosophies namely philosophy of perennialism, progressivism, essentialism, existentialism, humanism, and social reconstruction in the English in Mind Students' book and in the curriculum 2013. It means that there is no difference in philosophical foundation between the curriculum 2013 and textbooks. Both of them also emphasize on critical thinking skills, problem solving, communication and collaboration, creative and innovative and character development for students. Keywords: Philosophical foundation, curriculum 2013, textbook. 1. Introduction Teaching and learning activities between the teachers and the students will not be separated from a textbook. It is an important part of most EFL classes. It is also part of the curriculum that contains material for learning. Indonesia, at present, applies a curriculum 2013 that emphasizes on critical thinking and problem solving, communication and collaboration and character development of students such as creative and innovative (Madya, 2013). The educational philosophy arises from the interaction of philosophy and education. It is a theory that underlies