“…Regarding educational issues, studies have mainly focused on benefits, challenges, and limitations associated with OER (Wiley et al, 2014), their creation and distribution (open textbooks, repositories, OCW courses and MOOCs), and their important role in open education (Lane & McAndrew, 2010;UNESCO, 2011;OECD, 2015). There are many studies on metadata evaluations of ROER (Bueno-de-la-Fuente, Hernández-Pérez, Rodríguez-Mateos, Méndez-Rodriguez, & Martín-Galán, 2009), but these adopt a formal and technological perspective rather than analyze the educational relevance of ROER (Rodríguez, Dodero & Sánchez-Alonso, 2011;Atenas & Havemann, 2013). Therefore, the current study aims to explore how ROER support teaching and learning, based on educational requirements.…”