Developing Instructional Parts of Speech Book in Grammar Class of English Dormitory in Salafiyah Syafi’iyah Islamic Boarding School Sukorejo Situbondo

This study is supposed to develop theoretical grammar book Conquering Parts of Speech as teaching and learning resource for EFL students by considering the lack of teaching and learning source in grammar lesson. The kind of this research was research and development (R&D) by following Borg and Gall’s procedures. Subject used in this research was English dormitory member in Salafiyah Syafi’iyah Islamic boarding school located at Sukorejo Situbondo East Java. Research steps were including; Media product development, expert validation, practice, and product trial. Product trial steps consisted three field-testings; Preliminary field-testing, main field-testing, and operational field-testing. In the preliminary, ten students were taken as the subject of the research. In the main, twenty students were taken as the research subject. Thirty students were taken as the subject at the operational. After the product had been validated by experts and practitioners as it was concluded to be proper to field-testings. This product was asserted proper to implement as the results of three field-testings; Preliminary field-testing showed 425 as the total result with 85% percentage which was categorized as very proper. Main field-testing showed 880 as the total result with 88% percentage which was categorized as very proper. Operational field-testing showed 1263 as the total result with 84% percentage which was categorized as very proper.