Mechanical clearance relies on flails, rollers, vegetation cutters and excavators, often attached to armoured bulldozers, to destroy the mines in the ground. These machines can only be used in certain terrains, and are expensive to operate. In most situations they are also not 100% reliable, and the work needs to be checked by other techniques. Mine Risk Education (MRE) Risk education, or RE, refers to educational activities aimed at reducing the risk of injury from mines and unexploded ordnance by raising awareness and promoting behavioural change through public-information campaigns, education and training, and liaison with communities. RE ensures that communities are aware of the risks from mines, unexploded ordnance and/or abandoned munitions and are encouraged to behave in ways that reduce the risk to people, property and the environment. Objectives are to reduce the risk to a level where people can live safely and to recreate an environment where economic and social development can occur free from the constraints imposed by landmine contamination. RE, along with demining (which includes technical surveys, mapping, clearance of unexploded ordnance and mines, marking unsafe areas, and documenting areas that have been cleared), contributes to mine-risk reduction, or limiting the risk of physical injury from mines and unexploded ordnance that already contaminates the land. Advocacy and the destruction of landmine stockpiles focus on preventing future use of mines. "Education and training" in MRE encompasses all educational and training activities that reduce the risk of injury from mines, unexploded ordnance and/or abandoned munitions by raising awareness of the threat to individuals and communities and promoting behavioural change. Education and training is a two-way process, which involves the imparting and acquiring of knowledge, changing attitudes and practices through teaching and learning. Education and training activities may be conducted in formal and non-formal environments: teacher-to-child education in schools, information shared at home from parents to children or from children to their parents, child-to-child education, peer-to-peer education in work and recreational environments, landmine safety training for humanitarian aid workers and the incorporation of landmine safety messages in occupational health and safety practices. Victim Assistance Building on the experience gained in this area since the entry into force of the Antipersonnel Mine Ban Treaty the negotiators of the Convention on Cluster Munitions agreed on a specific article on victim assistance (Article 5), which contains a number of obligations for States Parties with respect to cluster munition victims in areas under