Content’s Connectivity between High School Science Textbooks and Middle School Science Textbooks

The purpose of this study is to examine the connectivity of related contents with middle school science textbooks as one of the objective causes of the difficulty in high school science textbooks (convergence science). The results were as follow : There are gaps of the levels of related contents in 46 (50.6%) of 96 content elements in the curriculum of high school science. Also, the gaps of the levels of related contents have been more increased since 88 novel concepts except the content elements presented in the science curriculum have shown in high school convergence science textbooks. It can be concluded that these factors are the underlying cause that makes the difficulty of teaching and learning. These findings suggest that it is necessary to consider the connection with middle school science text books when the high school convergence science textbooks are developed based on the 2015 revised national science curriculum having the same content system with the old one.