The Effectiveness Of Using Differentiated Instruction Strategies - based Program In Teaching History for developing some of the Historical Concept  and the Creative Thinking skills among Second  year of preparatory school students   The present study aimed at investigating The Effectiveness of Using Differentiated Instruction Strategies - based Program in Teaching History for developing some of the Historical Concept and the Creative Thinking skills among Second year of preparatory school students. The study sample consisted of (38) pupils among the second-grade prep stage pupils. The study tools  was a test to measure some of the Historical Concept  ,and a test to measure some of Creative Thinking skills among the second-grade prep stage pupils.The study tools were conducted as pre-application and post-application.   The study findings and results showed that: - There was a statistically significant difference at the level of (α 0.01 ≥) between the pupils' scores means in the pre-application and theirs in the post-application. This means that the program was effective in developing developing some of the Historical Concept among the second-grade prep stage pupils. - There was a statistically significant difference at the level of (α 0.01 ≥) between the pupils' scores means in the pre-application and theirs in the post-application. This means that the program was effective in developing developing some of the Creative Thinking skills among the second-grade prep stage pupils.