Abstract :
It is known that the errors in using subject verb agreement makes the students difficult in writing. This is why the study brings purposes, viz:1) to reveal the students? ability in subject verb agreement. 2) to uncover the students descriptive writing errors. 3) to design and develop the writing materials to solve writing error in subject verb agreement for the tenth grade tourism students of SMK N 1 Pacitan in Academic Years 2018/2019. This study is new prespective, even though there are previous studies that have similar topic. This study used R&D design. Data was collected through questionnaire, tests and documentation. The quantitative data were collected to get judgement towards the product. The qualitative data were the score of the product which were interpreted to be description of the product. The first test shows that 18 of 22 students (81.82%) have low understanding in subject verb agreement. The second test shows that the most errors occurs in misformation (subject verb agreement area). The media expert gives good category with the score of "82.92" to the developed media. The material expert gives ?80.16? which is categorized as ?good?. English teacher gives "80.00" which means "good" category. The students give score "81.43" for the material which is categorized as ?good?. In conclusion, the writing material in subject verb agreement is appropriate to be used as writing materials for the tenth grade of tourism students in the learning process. The students should use this product to deepen their understanding about subject verb agreement.
Keywords: Research and Development, Writing Skill, Writing Errors, Subject Verb Agreement