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The effectiveness of Realistic Model PBLs is tested towards the communication skills and mathematical disposition of vocational high school students. For this purpose, it is used 2 × 2 factorial research design. The sample is determined by two stages of random sampling technique. From this research, it is found that 1) there is difference of mathematical communication ability of vocational high school students based on mathematical disposition level (high, low. 2) there is difference of mathematical communication ability of vocational high school students based on learning model (Realistic Model PBL, Conventional) 3) there is no interaction between learning model with mathematical disposition on the ability mathematical communication of vocational high school students. Keywords—Realistic Model PBL, communication, disposition

Effectiveness of the Realistic Problem Based Learning Model Development Toward Communication Skills and Mathematical Disposition of Vocational High School Student