CRDG’s Program Research & Evaluation Section is in its second year of a project funded by the National Science Foundation to look at the effects of professional development on curriculum implementation and the “scaling-up” of curricula. To do this, CRDG curriculum developers and researchers are developing alternative versions of the Foundational Approches in Science Teaching (FAST) program’s professional development and are preparing data-collection instruments for the second phase of the project, which will begin in 2005. The project’s long-term findings will have implications for revising the FAST program and for teacher professional development, curriculum implementation, and curriculum scaling-up nationwide.