Cynthia Griffin

The purpose of this project is to test the efficacy of Prime Online, an online teacher professional development (PD) intervention to improve teachers' knowledge and practice and students' mathematics achievement. Research suggests that a substantial portion of the variability in students' mathematics achievement is related to the quality of teachers' instruction. However, little is known about effective ways to improve teachers' mathematics teaching, especially with students who struggle wit...

According to the National Assessment of Educational Progress, 85 percent of students without disabilities in fourth grade scored above Basic in mathematics in 2007. However, only 60 percent of students with disabilities achieved this minimal standard. Strong research evidence reveals that a substantial part of the variability in student achievement gains is due to the effectiveness of a given teacher. This finding could be explained in part by differences in teachers' mathematical content k...