Cheryl Rose Tobey is a senior mathematics associate at Education Development Center (EDC) in Massachusetts. She is the project director for "Formative Assessment in the Mathematics Classroom: Engaging Teachers and Students" (FACETS) and a mathematics specialist for "Differentiated Professional Development: Building Mathematics Knowledge for Teaching Struggling Students" (DPD); both projects are funded by the National Science Foundation (NSF). She also serves as a director of development for an Institute for Educational Science (IES) project, "Eliciting Mathematics Misconceptions" (EM2). Her wo...