However, a United Nations report, Guiding Principles on Internal Displacement uses the definition of: persons or groups of persons who have been forced or obliged to flee or to leave their homes or places of habitual residence, in particular as a result of or in order to avoid the effects of armed conflict, situations of generalized violence, violations of human rights or natural or human-made disasters, and who have not crossed an internationally recognized State border.
However, as Erin Mooney has pointed out, "global statistics on internal displacement generally count only IDPs uprooted by conflict and human rights violations.
They note that re-framing responses to urban displacement will also involve human rights and development actors and local and national governments.
Until the mid-2000s, it conditioned involvement to cases where there is a specific request by the UN Secretary-General and with the consent of the State concerned it has been willing to respond by assisting IDPs in a given instance.
"Under this agreement, UNHCR will assume the lead responsibility for protection, emergency shelter and camp management for internally displaced people.
"[35] In 2019, UNHCR issued an updated IDP policy that reaffirms its commitment to engaging decisively and predictably in situations of internal displacement.
On the basis of its long experience in different parts of the world, the ICRC has defined an operational approach towards the civilian population as a whole that is designed to meet the most urgent humanitarian needs of both displaced persons and local and host communities.
[37]However, its Director of Operations has earlier recognized that IDPs "deprived of shelter and their habitual sources of food, water, medicine and money, they have different, and often more urgent, material needs.
There is also no predictability of action, as the different agencies are free to pick and choose the situations in which they wish to become involved on the basis of their respective mandates, resources, and interests.
[43] The cluster approach designates individual agencies as 'sector leaders' to coordinate operations in specific areas to try to plug those newly identified gaps.
Egeland called for strengthening the leadership of the sectors, and introduced the concept of "clusters" at different levels (headquarters, regional, country and operational)'.
At the global level, the approach is meant to build up capacity in eleven key 'gap' areas by developing better surge capacity, ensuring consistent access to appropriately trained technical expertise and enhanced material stockpiles, and securing the increased engagement of all relevant humanitarian partners.
The cluster approach was part of a package of reforms accepted by the IASC in December 2005 and subsequently applied in eight chronic humanitarian crises and six sudden-onset emergencies.
Some other countries have advocated re-thinking the definitions and protections for refugees to apply to IDPs, but so far no solid actions have come to fruition.
They have been endorsed by the UN General Assembly, the African Commission on Human and People's Rights (ACHPR) and by the signatories to the 2006 Pact on Security, Stability and Development in the Great Lakes Region, which include Sudan, DRC and Uganda.
"[47] In September 2004 the Secretary-General of the UN showed the continuing concern of his office by appointing Walter Kälin as his Representative on the Human Rights of Internally Displaced Persons.
[48] In so-called "post-conflict" situations, there has traditionally been an emphasis in the international community to seek to return to the pre-war status quo.
[49] Normally, pressure is applied by the international community and humanitarian organization to ensure displaced people are able to return to their areas of origin and the same property.
[49] The ODI calls on humanitarian agencies to develop an awareness of sustainable reintegration as part of their emphasis on returning IDPs and refugees home.