  TIMSS & PIRLS International Study Center is a research center at Boston
College that conducts a series of assessments in a number of countries to
measure trends in mathematics and science achievement at the fourth and eighth
grades. In general, TIMSS assessments include achievement tests as well as
questionnaires for student, parent, teacher, school, and curricular. There are
63 participating countries and 14 benchmarking participants in TIMSS 2011,
including 608,641 students, 49,429 teachers, 19,612 school principals, and the
National Research Coordinators of each country. TIMSS data are valuable for
researchers and analysts from all over the world, especially for those from
participating countries, to conduct related studies to improve education.
