"Fable Writer" is an online reading, writing and research tool designed to facilitate synchronous, collaborative writing tool that enables learners to read and copy text and images from teacher-curated books and Web-based resources in the "Fable Reader" digital library. The "Fable Writer" project addressed two essential activities in primary and secondary education, and in society more broadly: writing and collaboration. Writing well and working collaboratively and generatively in teams are skills that increasingly cut across job functions in the American workplace and are essential to success in college. "Fable" tools--"Reader," "Writer," and the accompanying classroom lesson plans--provide unique opportunities for elementary and middle school students to practice researching and writing together as they plan, draft, and submit writing pieces in a safe and closed online environment. Collaborative group learning has been shown to be a highly effective teaching strategy for improving student learning outcomes. Some research-based evidence indicates that when students work in pairs, collaborative writing can have a strong impact on the quality of the writing. In addition, there is evidence that students in writing pairs show higher self-esteem as writers. The study presented in this report examined whether and how an "all in one" digital tool can facilitate similar interactivity among elementary and middle school students. [This report was submitted to Isabella Products and Fable Learning.]