We have been investigating the potential of a web-based discourse platform Knowledge Forum (Bereiter & Scardamalia) to support grade 4 students' understanding of functions through linear generalizing problems. We will present verbatim discussions from the KF database that occurred when students from diverse urban classrooms were linked electronically to collaborate on a series of problems. Analyses of student contributions to the database revealed their increasing understanding of explicit functional relationships, formulate generalizations, and negotiations of multiple rules and representations. It appeared that KF supported students in providing justifications for their conjectures of functional rules within the context of specific problems.
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