Overall Findings: MBB's report indicates positive outcomes among children, teachers, and EC programs. MBB has a statistically significant impact on children's cognitive development. The results indicate that MBB may be particularly beneficial for younger preschool children, African-American children, and children from low-income families. The report indicates that statistically significant gains were made in classroom quality and teachers' instructional proficiency. The findings indicate that these gains are attributable to the work of the MBB Coaches. (author abstract)