The choice of a trainer or training company is a complex one that involves student aptitude, teacher quality, mode of information exchange (online, face-to-face, etc.), and is not easily recommended in a “one-size-fits-all” fashion. The following training companies have indicated to ONF (in various ways) that they offer training courses in SDN. We are planning an evaluation program (the ONF SDN-Approved Training Partner program) that will map how a training program maps to the certification blueprints for ONF SDN certifications. We encourage all students and organizations seeking training to thoroughly investigate the training and the instructors before making this important decision.