This paper will describe results concerning the impact of the PD on the three primary study outcomes: teacher knowledge of rational number topics, teacher instructional practices, and student achievement in rational number topics. All analyses are completed. However, the results cannot be shared at this time because the report is currently under peer review in the Institute of Education Sciences. The complete first year report is scheduled to be released fall of 2009, well before the SREE (Society for Research on Educational Effectiveness)conference. [For the accompanying papers, see Paper #1 (ED512819) and Paper #2 (ED512820).]