PKOs have a Security Council mandate and contain a basic description of the tasks to be performed by members of the mission. Which often vary depending on the situation in each case. Furthermore, the establishment of a PKO can be arranged at the request of a State, a group of States, at the proposal of the Secretary General or even by the Security Council's own decision. Furthermore, the Capstone doctrine specifies the types of tasks as well as the characteristics of "traditional" and "multidimensional" operations for maintaining