Abstract. Even though many studies have been conducted regarding to realistic mathematical concepts, there are only few researches on their implementation in vocational mathematics learning. This study aims at producing mathematics instructional materials development model and it’s prototype (meet the criteria of being valid, practical, and effective). This study was a research and development, which consisted of two steps, preliminary and formative studies. In the preliminary stage, content and construct analysis were carried out. Furthermore, in the formative study stage, self evaluation, prototyping and field tests were carried out. This development resulted into a conceptual model involving four stakeholders (tetra-helix) of development research, such as researchers, industry workers, teachers, and students. The tetra-helix model concept based on vocational realistic education is a model for developing mathematics instructional materials which can be used at vocational institution in the form of textbooks, job sheets, syllabus and lesson plans. They integrate the mathematical concepts learned with their realistic applications in industry (tourism, engineering, and e-commerce).

Keywords: vocational realistic education, tetra-helix