This site contains an initial sampling of resources and findings from NSF-funded projects. Their proposals underwent merit review; subsequent annual and final project reports were reviewed and approved. The resulting research-based resources have been pilot- or field-tested in schools or with teachers. The websites identified may offer additional information derived from their development and use with students, teachers, or other stakeholders. These resources and websites represent the work, findings, and conclusions of the Principal Investigators and do not necessarily reflect the views of the NSF.