The document summarizes lessons learned from Wikiwijs, a Dutch program from 2009-2013 that aimed to promote open educational resources (OER) in education. Some key lessons included: 1) Creating high quality OER is complex and requires careful tool design and teacher training; 2) Working from complete courses and textbooks is important, not just standalone content; and 3) Involving all stakeholders and implementing supportive policies is needed to encourage OER adoption by teachers and schools. Overall the program showed that quality, communities, and complete resources are important for successful OER implementation.