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Providing over 20 years of trend data, TIMSS has been a valuable tool for monitoring international trends in mathematics and science achievement at the fourth and eighth grades. Like the previous TIMSS assessments, TIMSS 2023 will collect detailed information about curriculum and curriculum implementation, instructional practices, and school resources. A new feature of TIMSS 2023 will be an innovative, group adaptive design that allows for a better alignment of the assessment with the student populations in the participating countries\n TIMSS 2023 completes the transition to a fully digital assessment\n Available in Grade 4 and Grade 8\n Mathematics and science, Grade 4: 14 booklets;\n Mathematics and science, Grade 8: 14 booklets\n Group adaptive design\n Available in digital format only \n paperTIMSS was administered in a small number of countries for whom the fully digital TIMSS may not be logistically feasible\n The next cycle of TIMSS will be administered in 2027.","descriptionType":"Abstract"},{"lang":"en","description":"TIMSS","descriptionType":"SeriesInformation"},{"lang":"en","description":"Self-administered questionnaire","descriptionType":"Methods"},{"lang":"en","description":"Self-administered questionnaire","descriptionType":"Methods"},{"lang":"en","description":"Educational tests and questionnaires","descriptionType":"Methods"},{"lang":"en","description":"\u003cstrong\u003eTarget population (students)\u003c/strong\u003e\nAll students enrolled in the grades representing 8 years of formal schooling respectively, counting from the first year of ISCED Level 1.","descriptionType":"Methods"},{"lang":"en","description":"STRATIFIED TWO-STAGE CLUSTER SAMPLE DESIGN","descriptionType":"Methods"}],"geoLocations":[{"geoLocationPlace":"International: TIMSS Grade 8 (.......number of countries), e-TIMSS Grade 8 (.......number of 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