Execution and implementation thumb|258x258px|The International Court of Justice is often called upon to aid in the interpretation or implementation of treaties. Treaties may be seen as "self-executing", in that merely becoming a party puts the treaty and all its obligations in action. Other treaties may be non-self-executing and require "implementing legislation"—a change in the domestic law of a state party that will direct or enable it to fulfill treaty obligations. An example of a treaty requiring such legislation would be one mandating local prosecution by a party for particular crimes.
Execution and implementation thumb|258x258px|The International Court of Justice is often called upon to aid in the interpretation or implementation of treaties. Treaties may be seen as "self-executing", in that merely becoming a party puts the treaty and all its obligations in action. Other treaties may be non-self-executing and require "implementing legislation"—a change in the domestic law of a state party that will direct or enable it to fulfill treaty obligations. An example of a treaty requiring s.uch legislation would be one mandating local prosecution by a party for particular crimes.