OER Knowledge CloudJournal ArticleOpen Educational Resources: Reviewing initiatives and issuesOpen Educational Resources: Reviewing initiatives and issues20092009/02D'Antoni, SusanOER historyUNESCOchallengesOER adoptionengOpen Learning: The Journal of Open and Distance Learning2413-100268-0513This is an introduction to the special issue on OERs. It provides information on the provenance of the term, history of OERs, rational for use and some barriers, and UNESCO initiative10.1080/02680510802625443