Readability of Reading Materials in Kemendikbud English Textbook Revised 2016 for the Tenth Grade Students of Computer and Network Engineering Program at SMKN 1 Dolok Masihul

This study was aimed to describe the readability level of the reading materials in Kemendikbud English textbook revised 2016 for the tenth grade students of computer and network engineering program written by Utami Widiati, et al. The design of this research is used descriptive qualitative research. The subject of this research is Kemendikbud English textbook revised 2016 for the tenth grade students of computer and network engineering and an English teacher at SMKN 1 Dolok Masihul. The instruments of the data collection in this study were interview and Flesch Reading Ease Formula. The researcher analyse the data to get judgment from professional teacher by interview and analyse the reading materials in textbook used Flesch Reading Ease Formula to determine the level of readability. Therefore, the researcher takes a conclusion that the result of interviewing English teacher was the students ability in comprehend the reading texts still low and the readability of reading materials in the textbook fairly difficult to comprehend by the students and the result of the data analysis by using Flesch Reading Ease formula indicates that the texts can be categorized; fairly easy, fairly difficult and difficult.