We introduce an interactive online resource for use by students and collegeinstructors in introductory astronomy courses. The General Education AstronomySource (GEAS) online tutor guides students developing mastery of coreastronomical concepts and mathematical applications of general astronomymaterial. It contains over 12,000 questions, with linked hints and solutions.Students who master the material quickly can advance through the topics, whileunder-prepared or hesitant students can focus on questions on a certain topicfor as long as needed, with minimal repetition. Students receive individualaccounts for study and course instructors are provided with overview trackinginformation, by time and by topic, for entire cohorts of students. Diagnostictools support self-evaluation and close collaboration between instructor andstudent, even for distance learners. An initial usage study shows clear trendsin performance which increase with study time, and indicates that distancelearners using these materials perform as well as or better than a comparisoncohort of on-campus astronomy students. We are actively seeking newcollaborators to use this resource in astronomy courses and other educationalvenues.
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