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The IEA's Trends in International Mathematics and Science Study (TIMSS) is a series of international assessments of the mathematics and science knowledge of students around the world. The participating students come from a diverse set of educational systems (countries or regional jurisdictions of countries) in terms of economic development, geographical location, and population size. In each of the participating educational systems, a minimum of 4,500 to 5,000 students are evaluated. Furthermore, for each student, contextual data on the learning conditions in mathematics and science are collected from the participating students, their teachers and their principals via separate questionnaires. TIMSS is one of the studies established by the International Association for the Evaluation of Educational Achievement (IEA) aimed at allowing educational systems to compare students' educational achievement and learn from the experiences of others in designing effective education policy. This study was first conducted in 1995, and has been performed every 4 years thereafter. In most of the cycles the study assesses 4th and 8th grade students. Therefore, some of the participating educational systems have trend data across assessments from 1995 to 2011.