Abstract:
This study was quasi-experimental research. The purposes of this research were to 1) compare the scientific reasoning ability of students who learn science through Socioscientific Issues based-learning before and after experiment and 2) compare the scientific reasoning ability of students between experimental group and controlled group. The samples were 8th grade students of large-sized secondary school in Bangkok, selected by purposive sampling into two classrooms, which were divided into experimental group of 40 students and controlled group of 38 students. The research instruments were (1) the scientific reasoning ability test and (2) Socioscientific Issues based-learning lesson plans and traditional lesson plans. The experimental period was 9 weeks. The collected data were analyzed by arithmetic mean, standard deviation, paired-samples t-test and analysis of covariance (ANCOVA).The results of this study showed that1) after experiment, students who learned Science through Socioscientific Issues based-learning had higher mean scores of scientific reasoning ability than before the experiment at .05 level of significance2) after experiment, students who learned science through Socioscientific Issues based-learning had higher mean scores of scientific reasoning ability than students who learned Science with traditional instruction at .05 level of significance.