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Abstract

This study aimed to describe both process and result of the development of teaching materials used to enhance higher order thinking skills based on open ended problem and its products should be valid, effective and practice. This study adopted a 4D developmental model modified be 3D which comprises three stages: define, design, and develop. The results showed: (1) The teaching materials that have been develop declared valid with the mean score 3,30, lesson plan declared valid with the mean score 3,125, achievement test declared valid with the mean score 3,45, (2) effectiveness characterized by whole class achievement test mean score obtained 78,83, and whole class questionnaire mean score obtained 2,35, (3) practicality of teaching materials characterized by observation sheet mean score for whole observer obtained 3,6, and (4) using open ended problem significantly enhances students higher order thinking skills, as well as students justify effectiveness of several procedure that is followed by appropriate arguments, integrate different characteristic within it’s unity, also think creatively construct the problem themselves.

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