A state succession can be characterized as either being universal or partial. A universal state succession occurs when one state is completely extinguished and its sovereignty is replaced by that of one or more successor states. A partial state succession occurs when the state continues to exist after it has lost control of a part of its territory.
An example of a partial state succession is the case of the split of Bangladesh from Pakistan, there was no challenge to Pakistan's claim to continue to exist and to retain its membership of the United Nations: it was a continuator and not a successor. Bangladesh eventually was recognised as a new state: it was a successor and had to apply for UN membership.
Consequent upon the acquisition of international personality, the difficult matter of succession to treaty rights and obligations arises. Succession may refer to the transfer of rights, obligations, and/or property from a previously well-established prior state (the predecessor state) to the new one (the successor state). Transfer of rights, obligations, and property can include overseas assets (embassies, monetary reserves, museum artifacts), participation in treaties, membership in international organizations, and debts. Often a state chooses piecemeal whether or not it wants to be considered the successor state.
A special case arises, however, when the predecessor state was signatory to a human rights treaty, since it would be desirable to hold the successor state accountable to the terms of that treaty, regardless of the successor state's desires. Daniel Patrick O'Connelll wrote, "Practice is tending towards a de facto succession to at least those conventions which have a humanitarian aim."