In this study, the authors examined whether a classroom intervention would improve the ability of prospective elementary teachers to identify and evaluate evidence of student understanding of a mathematical lesson. The participants in this study were 192 prospective elementary teachers who enrolled in the first mathematics content course at a Mid-Atlantic University. The prospective teachers completed pre- and posttests individually outside of regular class times, and the interventions were implemented by each of six course instructors during regular course meetings. The results indicate that the intervention was successful in improving at least some of PTs’ analysis skills.