The American Journal of Psychology, Vol. 107, No. 3 (Autumn, 1994), pp. 423-439 (17 pages) Students in 11th grade (N = 208) were assessed twice on the solution of algebraic word problems that ...

We illustrate a method, which is modeled on "breaching experiments," for studying tacit norms that govern classroom interaction around particular mathematical content. Specifically, this study ...