A/HRC/11/7 page 22 87. Migration policies, programmes and bilateral agreements should preserve family unity, including by facilitating family reunification and interaction among family members. Information-sharing, data and analysis 88. States should strengthen efforts to collect data and measure the impact of migration on children in countries of origin, transit and destination, with due regard for the opportunities and challenges for children in all stages of the migration process. 89. States are especially encouraged to share across boundaries and regions information about key indicators of the impact of migration on children, as well as common challenges and best practices to address migrant children protection-related gaps at all levels. It is also important that stakeholders contribute to make available statistical and substantive information on, inter alia, the root causes of migration of children and adolescents (with family members or unaccompanied), to help States to identify policy gaps. Protecting children left behind in countries of origin 90. The Special Rapporteur recommends that the situation of children staying behind in countries of origin be included in the agenda of international debates and forums on migration issues and that all relevant actors undertake further studies to better understand the impact of migration processes on the well-being and enjoyment of human rights of the children left behind in countries of origin. 91. The Special Rapporteur recommends the compilation and sharing of best practices in addressing the situation of children left behind in countries of origin, especially in the area of education. 92. States should develop public policies to address the situation of children left behind in countries of origin, taking into account the best interest of the child as a guiding principle and ensuring the participation of these children in the design and implementation of those policies. 93. The Special Rapporteur encourages States to develop public policies to prevent the irregular migration of children and undertake public information campaigns in communities of origin to alert them to the dangers of irregular migration and to inform them of the existing protection mechanisms. Protecting children on the move 94. The Special Rapporteur encourages the collection of data at the national level and the preparation of studies and research on unaccompanied or separated children. 95. States should recognize that general comment No. 6 of the Committee on the Rights of the Child on the treatment of unaccompanied and separated children provides useful guidance for the protection of the rights of unaccompanied migrant children. 96. States should recognize that migrant children, especially those unaccompanied, are most exposed to the worst forms of child labour and, in this context, recalls the relevance of