Method
TIMSS consists of an assessment of mathematics and science, as well as student, teacher, and school questionnaires. The current assessment includes those topics in mathematics and science that students are likely to have been exposed to up to and including grade 4 and grade 8.
Two different scoring systems have been used. In one the final score is adjusted so that the average is always 500 and standard deviation is always 100 for each test. This is recalculated for each test year so that these values stay the same. In another system the 1995 average and standard deviation are kept for subsequent years which may cause the subsequent years to have different averages and standard deviations from 500 and 100. This in part due to participating nations changing. This system allows easier comparisons between testing years.
Read more about this topic: Trends In International Mathematics And Science Study
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