The quality level of the content of physics text books for the secondary stage in light of the cross-cutting concepts of the Next Generation Science Standards (NGSS) and physics teachers’ perceptions of them

The aim of the research is to find out to what extent the content of physics text books of the secondary level in Egypt corresponds to Cross-Cutting Concepts (CCCs) of the Next Generation Science Standards (NGSS), and to identify to what extent the teaching practices of physics teachers reflect these concepts from their point of view.To achieve the goal of this research, a content analysis card was designed based on Cross-Cutting Concepts (CCCs), and its validity and reliability were verified.A questionnaire was also designed and applied to a sample of secondary school physics teachers to determine the reflection of the standards of these concepts in their teaching practices from their own point of view.For this purpose, the descriptive analytical method was used. Research results showed a low representation of Cross-Cutting Concept standards in the content of physics textbooks at the secondary level.As well as the low representation of secondary school physics teachers of Cross-Cutting Concept in their teaching practices in general from their point of view.The research recommended the need to develop the content of the physics curriculum in a way that is consistent with the Cross-Cutting Concepts (CCCs) of the Next Generation Science Standards (NGSS), and to develop physics teachers’ understanding of these contomprory standard and how to employ them in their teaching practices.