Bullying, particularly among school-age children, is a major public health problem both domestically and internationally. Current estimates suggest that nearly 30% of American adolescents reported at least moderate bullying experiences as the bully, the victim, or both. Specifically, of a nationally representative sample of adolescents, 13% reported being a bully, 11% reported being a victim of bullying, and 6% reported being both a bully and a victim. This book provides researchers, prevention specialists, and health educators with tools to measure a range of bullying experiences: bully perpetration, bully victimisation, bully-victim experiences and bystander experiences. The ability to measure bullying experiences broadly and completely is crucial to the success of these activities.