Another challenge is the tension between peace and justice, which arises the conflicting goals of achieving peace and justice in the aftermath of a society’s emergence from conflict. Though it is generally unanimous that both goals are integral to achieving reconciliation, practitioners often disagree about which goal should be pursued first: justice or peace? Proponents of the “justice” school of thought argue that if all perpetrators of human rights abuses do not stand trial, impunity for crimes will continue into the new regime, preventing it from fully completing a transition from conflict. The "peace" school of thought, however, argues that the only way to effectively end violence is by granting amnesties and brokering negotiations to persuade criminals to lay down their arms.[http://www.economist.com/debate/days/view/744] Examples such as Northern Ireland illustrate how selective amnesties can cease conflict.