Formerly the Coalition to Stop the Use of Child Soldiers,[3] Child Soldiers International was founded in 1998 by leading human rights and humanitarian organisations, including Human Rights Watch, Amnesty International and Save the Children. Its purpose was to campaign for the adoption of the Optional Protocol to the Convention on the Rights of the Child on the involvement of children in armed conflict (OPAC)[4] – a human rights treaty that prohibits the use of children in armed conflict and raises the age of military recruitment. The treaty was adopted in 2000 and entered into enforcement phase on 12 February 2002.