OER Knowledge CloudJournal ArticleOpenness and flexibility are the norm, but what are the challenges?Openness and flexibility are the norm, but what are the challenges?Naidu, Som20172017/01RoutledgeDistance Education38121-410.1080/01587919.2017.12971851475-0198yessustainabilityOERMOOCdistance educationOpenness and flexibility are the norm but what are the challenges.pdf