This article describes an authentic project-based learning. The article overviews the approach and impact of an online professional development course for those in education and training, including school teachers and their schools in New Zealand and abroad. The data show that practice with online and blended learning during this course appears to have contributed to participants’ rate of adoption of similar approaches in their own professional contexts. The authors argue that the design of this postgraduate course can be seen to enhance relative advantages of online and blended learning in each student’s professional work, while also reducing the complexity of these innovations.