It can be seen that "fragmentation" can have several dimensions, and that the difference between juridical approaches as well as legislative approaches to treaty or other norm stating documents can result not only from different institutional settings, but also from different policy goals assumed for differing dispute settlement systems.
John H. Jackson,
The Varied Policies of International Juridical Bodies- Reflections on Theory and Practice,
Mich. J. Int'l L.
Available at: https://repository.law.umich.edu/mjil/vol25/iss4/4