This research aims at developing supplementary materials for Business English
using Task-Based Learning (TBL). It was conducted to investigate (1) the quality of the
existing course book used in vocational high school, (2) the development of supplementary
materials using TBL at SMK PGRI 2 Kediri.
Research and Development (R&D) as proposed by Borg and Gall is used in this study
and was conducted through two main phases namely (1) exploration phase and (2) product
development phase explained. The exploration phase revealed: (1) the description of the
existing coursebook used in vocational high school and (2) the need analysis of the ESP
learning material. While the product development phase explained; (1) the description of the
draft of the materials, (2) the result of the trial of the draft, and (3) the final draft of
supplementary materials for Business English.
The data in the exploration stage were collected through conducting document
analysis, and having interview. It was carried out to reveal the qualityof existing coursebook
used at vocational high school and the learner’s need toward material. The findings show that
the course book used at the vocational high school students contains general english material
and it is less specific to be used for the students of marketing department. Hence, the findings
imply the Business English supplementary material was needed to be developed by
considering the needs of the teacher and the students. The Business English supplementary
materials was developed by considering some aspects. It contains theoretical theories of ESP
and TBL. Then, it was validated and reviewed by some experts on English language teaching
and implemented in class. Through conducting observation, distributing questionnaire, and
having focus group discussion that involved the researcher, the teacher, the expert and the
students, the draft was revised to be the final draft of Business English supplementary
material. Therefore, after going through the stages, it could be said that the draft is feasible to
be applied as supplementary material to teach the students of marketing department at
vocational high school. It is expected that the book can give some contribution and
improvement for English teaching and learning.
Keywords: ESP, TBL, supplementary material, research and development study