Thailand's education system stands at a crossroads. Significant investment has widened access to education and the country performs relatively well in international assessments compared with its peers. But the benefits have not been universally distributed and Thailand has not received the return on its spending on education that it might have…

The research reported in this case study explores the understanding of stoichiometry and related concepts of Thai science students in grades 10 and 11 after major national curriculum reforms. Students' conceptions and alternative conceptions were investigated using a questionnaire--the "Stoichiometry Concept Questionnaire" (SCQ) (N =…