1999 TIMSS-R International Benchmarks of Science Achievement
Top 10%: Students demonstrate a grasp of some complex and abstract science concepts.
Upper 25%: Students demonstrate conceptual understanding of some science cycles, systems, and principles.
Upper 50%: Students can recognize and communicate basic scientific knowledge across a range of topics.
Upper 75%: Students recognize some basic facts from earth, life, and physical sciences presented using non-technical language.