LON-CAPA is a distributed open-source Learning Content Management and Assessment System that provides instructors with a common, scalable platform to assist in several aspects of teaching a course, from lecture preparation, communication among faculty and students, calendar keeping and announcements, to administration of homework assignments and exams. It also enables instructors to create educational materials and to share such learning resources with colleagues across institutions in a simple and efficient manner. KEYWORDS Open Source Learning Content and Course Management System, Online Assessment