Various fields of international law differ along many lines. There are also some concepts that have different meanings in different fields of international law. The proliferation of fields of international law carries with it the risk of fragmentation in international law. In a 2006 report, the International Law Commission observed that coherence can be maintained in international law despite such increase in fragmentation.

It bases its analysis on the concept of necessity in the law of the World Trade Organization (WTO) as compared with the concepts of necessity in other fields of international law, especially that in customary international law (CIL). It then examines if there is a potential for these two key concepts of necessity to learn from (i.e., interinfluence) each other. As such, this research aims, among others, to contribute to the scholarship on the fragmentation and coherence of international law.
 

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