Wisconsin Virtual School, a state online learning program that offers supplemental online courses to partner districts in Wisconsin, administered a survey to its teachers in fall 2014 to learn more about their training experiences and challenges. More Wisconsin Virtual School teachers reported participating in training or professional development related to online instruction while teaching online than before teaching online or during preservice education. The most frequently reported professional challenges concerned student engagement with and perseverance in online courses. Wisconsin Virtual School teachers indicated that they preferred unstructured professional development to structured professional development for addressing challenges related to students' perseverance and engagement. [For the full report, see ED561235.]