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Measuring Trends in Mathematics and Science Achievement
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Trends from 1995 to 1999

TIMSS was first administered in 1995, when 41 countries assessed the mathematics and science achievement of students in the third, fourth, seventh, and eighth grades, and in the final year of secondary school. In 1999, 38 countries, including 26 of those participating in 1995, assessed their eighth graders' achievement. For these 26 countries, the 1999 assessment was an opportunity to gather two kinds of trend data.

These countries now have eighth-grade achievement and background data for 1995 and 1999, as well as data showing changes between the two assessment years.
Students who were in fourth grade in 1995 were in eighth-grade in 1999. The countries participating in both assessment years can see how this cohort of students performed in mathematics and science, relative to other countries in 1999, and if this has changed from 1995.

2003 and Beyond

The next TIMSS assessment will take place in 2003. This assessment will provide countries that participated in 1995 and 1999 the opportunity to study trends in eighth-grade mathematics and science achievement and background at three points over an eight-year period, and the 1999 countries an opportunity to measure trends from 1999 to 2003. In addition, the 2003 assessment also will include fourth-grade, providing an opportunity to collect trend data for this grade level for two points, 1995 and 2003.


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Assessing mathematics and science
Researching the factors associated with achievement: TIMSS 1999 Background Questionnaires
Sampling schools and students