The purpose of this qualitative case study was to determine the effect of lesson study on teachers' mathematical understanding. This study reviewed a three year program called SEISMIC which implemented lesson study within a school district. The goal was to increase teacher and student understanding of mathematics' Teacher understanding of…

The Third International Mathematics and Science Study (TIMSS) provides extensive comparisons of cross-national rankings in achievement as well as rich, descriptive analyses of the students, teachers, and schools participating in the study. In spite of the wealth of achievement and descriptive data available, the two are rarely linked in research.…