International Journal of Research and Review Vol. 10; Issue: 7; July 2023 Website: www.ijrrjournal.com Research Paper E-ISSN: 2349-9788; P-ISSN: 2454-2237 International Journal of Research and Review (ijrrjournal.com) 176 Volume 10; Issue: 7; July 2023 Enhancing English Reading Proficiency in Agriculture Vocational High Schools: Developing ESP-Based Supplementary Materials for Grade X Students Novita Ngabito 1 , Moon Hidayati Otoluwa 2 , Rasuna Rasid Talib 3 1 Postgraduate Program of English Education, Universitas Negeri Gorontalo, Gorontalo, Indonesia 2,3 Department of English Education, Faculty of Letter and Culture, Universitas Negeri Gorontalo, Gorontalo, Indonesia Corresponding Author: Moon Hidayati Otoluwa DOI: https://doi.org/10.52403/ijrr.20230724 ABSTRACT This research study aims to develop suitable supplementary English reading materials for tenth-grade students in the agriculture vocational high school program. The study utilizes the Research and Development (R&D) approach, focusing on the Analysis, Design, and Development stages of the ADDIE model. Data is collected through document analysis, questionnaires, and interviews from a class of 16 X-grade agriculture students and their English teachers at SMK Gotong Royong. Two types of questionnaires are employed: one for the needs analysis and another for expert judgment. The data is analyzed quantitatively and qualitatively, with mean central tendency measurement used to categorize the developed materials. Suharto's theory is utilized to determine the intervals and categories based on the scores obtained. The data analysis process involves organizing and preparing the data, reading and reviewing all the data, coding the data, generating descriptions and themes, and representing the findings. The research findings indicate the following target needs of the students: (1) understanding agriculture science texts and types of agriculture tools, (2) improving reading skills for agricultural work and acquiring relevant vocabulary, and (3) expanding their vocabulary related to the study program. The findings serve as the basis for the development of appropriate supplementary English reading materials. English teachers are encouraged to understand students' needs and add relevant sources or develop materials in collaboration with other teachers. Other materials developers are suggested to consider the learners' needs and the practical context of their field to create valuable materials for vocational high school students. Keywords: English reading proficiency, agriculture vocational high schools, ESP-Based supplementary materials, grade X students INTRODUCTION In the world of education in Indonesia, there are two categories of secondary schools, namely, the senior high school and the vocational high school. The vocational school is one of the formal education instances that offer a senior high level advanced junior high school program. Furthermore, in Indonesia, vocational schools are known as Sekolah Menengah Kejuruan (SMK) and Madrasah Aliyah Kejuruan (MAK) or other equivalent schools (Sikdinas No.20. 2003). The vocational school attempts to prepare pupils for a specific employment within their division. Students in vocational school are exposed to the world earlier and more precisely. According to Kotsikis (2007), vocational school education includes any type of