<![CDATA[The study was aimed to develop teaching material, hand out, using problem based learning useful to increase concept understanding of junior high school students in grade VII. Product quality valued by validity and practicality aspects. This study is a kind of research and development with procedure referred to 4–D developing models; define, design, develop, disseminate. However, the study was conducted to development aspect due to the limitation of research. The subjects of the study were the students of the VII grade of SMPN 25 Padang with 32 students. Furthermore, final test was conducted to see the ability of students’ concept understanding. Based on data analysis, data shows that : 1). Validity quality of the product met the valid criteria with lesson plan percentage mean 83,3 %, very valid category and the mean of hand out 80,1 %, valid category. 2). Product practicality quality met practical criteria, based on the questionnaire percentage mean filled by the students, 84 %, very practice category. 3). The result of students’ final test of concept understanding ability was 81 %, 26 from 32 students passed the test, 6 students failed based on school passing standard.]]>
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