This research aims at studying the effect of using the "Harmony of Similar Smithereens " method in the achievement and trends of the students in the "Social Studies " course The researcher applies this study on a sample of fourth grade students in Damascus Elementary Basic Schools. This method is applied on an experimental group the researcher makes an achievement trading test by using the "Harmony of Similar Smithereens " method and applied it on the experimental and control group and she applies the scale of trends which she prepared towards social studies and she used the statistical analysis program to make the results.