In this study, the authors examined the independent effects of teacher and mother expectations on youth achievement outcomes, the mediating factors that explain the relationship between adult expectations and student achievement, and the effects of congruent vs. dissonant adult expectations on achievement. Participants were an ethnically diverse sample of 522 low-income, urban youth (ages 9-16). Youth's mothers and teachers also participated. Findings show that adult expectations exert a significant influence on youth's academic competency and performance. Moreover, adult expectations matter both independently and conjointly: Comparably high mother and teacher expectations have a generative effect on youth outcomes, and comparably low mother and teacher expectations have a disruptive effect. Of particular interest are findings demonstrating the buffering effects of high mother expectations in the face of low teacher expectations.