This research was conducted to study the impact on students of a long-term professional development intervention in mathematics for teachers in a low-wealth, urban school district. The emphasis in this assessment design was on obtaining a more accurate picture of student's problem-solving performance which challenged us to raise our expectations about student success from improved standardized test score data to an approach that focused on the way students think about mathematical tasks. The design used in this assessment provides a framework for considering teacher development and student assessment simultaneously. Results show that students taught by project teachers performed better in both classroom problem-solving activities and task-based interviews than students taught by nonproject teachers. In addition, there were major differences in the problem-solving behaviors of the two groups. Experimental students (students of project teachers) displayed greater mathematical confidence, and were more likely to see mathematics as a powerful way of thinking about the real world and approach mathematics as such.
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