The purpose of this study was to investigate the effects of the Science Writing Heuristic (SWH) approach on the students` summary writing, logical thinking and achievements for the course. Participants in this study were 132 female students from a girls` middle school. The SWH approach was used for two experimental classes and the typical teacher-centered instructional approach was used for two comparative classes. Summary writing test, logical thinking test (GALT) and achievement test for the course were administered before and after the instruction period. Results of this study indicated that the SWH approach was helpful for students in finding big ideas, understanding science concepts, developing logical thinking abilities and doing well in the course. This study also implied that the SWH approach was effective for the low achieving students.