“…Although there are numerous studies on readability in the field of teaching Turkish as a native language, there are far fewer and more recent studies in the field of teaching Turkish as a foreign language. The studies in this field are generally gathered under headings such as supplementary reading books (Aydın, 2021;Bozkurt, 2021;Erişik, 2021) and textbooks (Yılmaz & Temiz, 2014;Erol, 2015;Zorbaz & Köroğlu, 2016;Mutlu, 2020;Şimsek, 2021;Özdemir & Dastan, 2022;Harmankaya, 2022;Karşılayan, 2022), and they are examined under these headings according to different language teaching levels of Turkish. It is seen that the vast majority of these studies at C1 level focus on Turkish teaching sets published by public institutions or widely used by these institutions, such as Yeni Hitit Turkish for Foreigners (Yılmaz & Temiz, 2014;Biçer & Alan, 2017), Gazi University Turkish for Foreigners (Zorbaz & Köroğlu, 2016;Bağcı, 2020), İstanbul Turkish for International Student (Biçer & Alan, 2017) and Yedi İklim Turkish for Foreigners (Mutlu, 2020).…”