The Security Council therefore requests the Secretary-General to initiate contingency planning without delay, jointly with the African Union, in close and continuing consultation with the Security Council, and in cooperation and close consultation with the parties to the Abuja Peace Talks, including the Government of National Unity, on a range of options for a possible transition from AMIS to a United Nations operation. Such planning should be undertaken on the basis of a unified, integrated approach; of maximum use of existing AMIS and United Nations Mission in Sudan (UNMIS) resources subject to the agreement of troop-contributing countries; of an assessment, to be confirmed by the Council, of the essential tasks to be carried out in southern Sudan and Darfur with a view to re-allocate existing troops and assets to the maximum extent practicable; and of a readiness to review and adjust the current structure of UNMIS, including command and control and logistics, at the earliest opportunity to make best use of available resources when the African Union deems a transition feasible and agreeable. The Security Council will be engaged throughout this process.