Willem van Valkenburg discusses the importance of OpenCourseWare (OCW) and Open Educational Resources (OER) as vital components of the open education movement, highlighting TU Delft's efforts in providing free, high-quality educational materials. As a leader in the OCW Consortium, TU Delft has expanded its course offerings significantly since its inception in 2007, focusing on enhancing educational quality and international collaboration. The presentation outlines the challenges faced, opportunities for growth, and future aspirations of OCW within the evolving digital educational landscape.