"The Research on Open Educational Resources for Development (ROER4D) project aims to provide evidence-based research from a number of countries in South America, Sub-Saharan Africa and Southeast Asia."
This study conducted a meta-analysis of studies examining OER efficacy in terms of learning performance and course withdrawal. The authors found no differences in learning efficacy between open textbooks and commercial textbooks, but did find that the withdrawal rate for postsecondary courses with open textbooks was significantly lower than that for commercial textbooks.
"In this chapter, authors Robin DeRosa and Scott Robison draw on a variety of examples to illustrate the empowering potential of open pedagogy [...]. The chapter concludes with a reflection on some of the challenges and lessons learned from engaging students in public scholarship."