PREFACE The Third International Mathematics and Science Study (TIMSS), sponsored by the International Association for the Evaluation of Educational Achievement (lEA) and the gov ernments of the participating countries, is a comparative study of education in mathematics and the sciences conducted in approximately 50 educational systems on five continents. The goal of TIMSS is to measure student achievement in mathematics and science in participating coun tries and to assess some of the curricular and classroom factors that influence student learning in these subjects. The study will provide educators and policy makers with an unparalleled and multidimensional perspective on mathematics and science curricula; their implementation; the nature of student performance in mathematics and science; and the social, economic, and edu cational context in which these occur. TIMSS focuses on student learning and achievement in mathematics and science at three different age levels, or populations. * Population 1 is defined as all students enrolled in the two adjacent grades that contain the largest proportion of 9-year-old students; * Population 2 is defined as all students enrolled in the two adjacent grades that contain the largest proportion of 13-year-old students; and * Population 3 is defined as all students in their final year of secondary education, includ ing students in vocational education programs. In addition, Population 3 has two "specialist" subpopulations: students taking advanced courses in mathematics (mathematics specialists), and students taking advanced courses in physics (science specialists).

Contributors to the volume represent an international "who's who" of research scientists from the fields of psychology and measurement. It offers the insights of these leading authorities regarding cognition and personality. In particular, they address the roles of constructs and values in clarifying the theoretical and empirical work in these fields, as well as their relation to educational assessment. It is intended for professionals and students in psychology and assessment, and almost anyone doing research in cognition and personality.

Contributors to the volume represent an international "who's who" of research scientists from the fields of psychology and measurement. It offers the insights of these leading authorities regarding cognition and personality. In particular, they address the roles of constructs and values in clarifying the theoretical and empirical work in these fields, as well as their relation to educational assessment. It is intended for professionals and students in psychology and assessment, and almost anyone doing research in cognition and personality.

PREFACE The Third International Mathematics and Science Study (TIMSS), sponsored by the International Association for the Evaluation of Educational Achievement (lEA) and the gov ernments of the participating countries, is a comparative study of education in mathematics and the sciences conducted in approximately 50 educational systems on five continents. The goal of TIMSS is to measure student achievement in mathematics and science in participating coun tries and to assess some of the curricular and classroom factors that influence student learning in these subjects. The study will provide educators and policy makers with an unparalleled and multidimensional perspective on mathematics and science curricula; their implementation; the nature of student performance in mathematics and science; and the social, economic, and edu cational context in which these occur. TIMSS focuses on student learning and achievement in mathematics and science at three different age levels, or populations. * Population 1 is defined as all students enrolled in the two adjacent grades that contain the largest proportion of 9-year-old students; * Population 2 is defined as all students enrolled in the two adjacent grades that contain the largest proportion of 13-year-old students; and * Population 3 is defined as all students in their final year of secondary education, includ ing students in vocational education programs. In addition, Population 3 has two "specialist" subpopulations: students taking advanced courses in mathematics (mathematics specialists), and students taking advanced courses in physics (science specialists).