<![CDATA[This study was aimed i) to find out the significant difference of students’ speaking achievement between oral presentation based on scientific approaches and conventional oral presentation and also ii) to find out what aspects of speaking significantly improve between control class and experimental class. The subjects of this research were the second grade of SMA Muhammadiyah 2 Bandar Lampung. The result shows that i) there was a statistically significant difference of students’ speaking achievement between oral presentation based on scientific approaches and conventional oral presentation, ii) Based on the gain score of each aspects of speaking, the comprehension aspect is significantly improve after taught using oral presentation based on scientific approaches. It can be said that oral presentation based on scientific approaches is more effective to improve the students speaking achievement than conventional oral presentation.Keywords: Oral presentation, scientific approach, speaking achievement.]]>
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