Abstract

The purposes of this research were 1) to develop student’s scientific reasoning ability on the concept of light and image at a criterion of 70 using inquiry-based learning 5E with prediction observation and explanation strategy and 2) to compare students’ scientific learning achievement on the concept of light and image after using inquiry-based learning 5E with prediction observation and explanation strategy. The target groups were 22 students of grade 9 selected by a purposive sampling method. The research instruments were lesson plans, achievement test, scientific reasoning ability test, scientific reasoning ability observation form, and scientific reasoning ability interview form the statistics used in data analysis were mean, percentage, and t-test. The results showed that 1) the scientific reasoning ability in cycles 1, 2, and 3. There were 6, 13, and 21 students who passed their criteria of 70% of the full score in each learning cycle, respectively. 2) Students’ learning achievement after learning with the learning management was significantly higher than the establishment at a criterion of 70 at a statistical level of .05.

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