It also calls for national surveys to be conducted to identify good practices and encourages cooperation among schools at both national and regional levels. They enhance understanding of perceptions and attitudes in relation to this phenomenon, including among girls and boys of different ages and social backgrounds, and help to identify children at greater risk to help provide them with effective support. In terms of national planning, research based on comprehensive data can inter alia, help quantify the economic cost of violence and identify the social returns that can be achieved with steady investment in prevention.