Development of international relations and exchanger connivance of national legislator, Possibility of enforcement foreign law, and, finally, existence of difference between domestic laws of countries , are among them factors of create opposition between laws.
For raising this conflict the first effective measure were compilation of laws which enable to remove the opposition relying on them, then, international society decided to remove this difficulty in a more comprehensive way. As a result the international society has succeeded to establish unity among countries in some of the legal issues by compilation and finally approval of conventions. Among the measures taken by present time is approval of 1973 convention but this convention has deal with the procedural form of will not the essence of it.
A part from that whether will is among personal status or not, it doesn't seem that establishment of unique regalement of unique regulations in the form of convention will oppose its essence, because the role of religion voids any importance in determining and practicing its details, and most important of all is that the state of religion will not fade establishing unique regulations about will studying the law of some countries, and also opinion of majority of lawyers make it clear that will isn't among the personal status, but is among the contracts and function of their general regulations.
If we can generalize this view, the idea of having unique regulations for will in international field, will take place more conveniently otherwise (being among the personal status) considering that establishing unique regulations for will due to similarity of essence and nature of humans, is perceptible it will not injure the specialty of human traits (personal status).
Therefore the possibility of amendment of international will is available in the 2 cases so that the testator may be able to express his (her) determination conveniently at every point of this terrestrial globe and for every person.