The document summarizes research on the use of open educational resources (OER) in adult education across eight European Union countries. It finds that while OER can provide benefits like more effective and lower-cost education, adoption of OER in adult education varies substantially between EU states. Some countries like Spain and Germany have made progress in developing national OER policies and platforms, while others like France, Hungary, and Latvia have seen little OER activity directed toward adult education. Barriers to greater OER use include restrictive copyright laws, lack of quality assurance processes for OER, limited OER training for educators, and low digital skills among adult learners.