The Trend of Change in Mathematics Performance of Grade 8 Iranian Students between 1999 to 2007 based on the TIMSS Findings in Iran and other Countries of the Region Considering the 20 Years Vision Document of Iran

In this survey، using a trend study، a comparison between the Iranian students’ performance and other countries of the region was done regarding cognitive and content domains، gender، and the degree in which، the performance is closed to the international benchmarks. The results show that the average of Iranian students’ performance in all the cognitive and content domains is different from what was expected. In fact، the ranking of Iranian students has decreased as the number of participating countries in TIMSS studies has increased. As well، the results of investigating the input benchmarks and educational processes show that the amount of these benchmarks in Iran is either lower or close to the average marks of aforementioned countries. Since the performance as an output is influenced by input and educational process، therefore to improve the mathematics performance of Iranian students، it is necessary to pay attention to the improvement of both input benchmarks and educational process.