 One study found that as conflict becomes more severe, peacekeeper mediators are more likely to meet separately with the disputants, to urge the disputants to relax, and to rely on force (Wall, Druckman, & Diehl, 2002).Peacekeeper mediation is done at the local level.Mediation at the intergovernmental level is a much older practice that has recently come under study with statistical analyses of large samples of historical mediations (Bercovitch & Houston, 2000).