 The latter book reported on the first of two large video surveys he directed in the 1990s, the TIMSS Video Studies, and compared eighth-grade mathematics teaching in Germany, Japan, and the United States.Most of his work has focused on mathematics teaching and learning.Through this work Stigler became well known for his work in the analysis of classroom video, both cross-culturally and within cultures as a means of explaining within-culture variation in teachers’ Value Added Assessment (VAE) scores.