Bullying is an urgent issue in many schools and crucial steps need to be taken to address it. In this episode of Top Class, Professor James O’Higgins Norman, the UNESCO Chair on Bullying and Cyberbullying, highlights a common but flawed response from teachers: “I haven’t seen it therefore it doesn’t exist.” What can schools and policymakers do to ensure bullying is tackled effectively, including extreme forms of bullying such as violent attacks? Professor O’Higgins Norman, who is based at Dublin City University where he is also Director of the DCU Anti-Bullying Centre, tells the OECD’s Duncan Crawford about the best practices and techniques to combat bullying and support victims.