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OpenEd is the largest educational resource library with over a million videos, assessments and homework on each and every Common Core standard and microconcept. OpenEd uses quizzes to determine the optimal resource for each student. The result is truly personalized learning for the first time. With its widely used and only free formative assessment bank, OpenEd knows true resource effectiveness, using that to suggest the best video for each student. OpenEd's app Common Core Quest quickly demonstrates this power of quizzing to select videos. It is the only app that drives from assessment to instruction and is the #1 Common Core app on the Google Chrome store and #2 on Google Play. OpenEd is used directly by over 300,000 teachers reaching millions of students. OpenEd's API for finding standard and skill-aligned resources is used by ed tech leaders such as Renaissance Learning, Promethean, Pacific Metrics and many more.