الملخص الإنجليزي
The extent of inclusion of TIMSS-2015 topics in Omani science textbooks. A Content analysis list has been developed according to these topics after it has been translated and verified by a paned of jury. However, the reliability coefficient between analysts has been calculated by using "kaba" equation given a value of (0.81). Results revealed in a variation percentage of this inclusion with respect to grade. In details, the inclusion appeared in the following order, physics (76.2%), biology (70.2%), chemistry (%69.6) and earth science (65.5%). Whereas, Knowledge domain scored (100%), applying (70%) and reasoning (45%) in cognitive process wise. Accordingly, the study recommended inclusion of (TIMSS) topics in science textbooks in line with the percentages which has been set by the Organization, and getting benefit from the experiences of the participant countries in TIMSS study which have achieved advanced rankings and how their sciences books included topics of TIMSS, lastly, the study also recommended conducting further studies.
