Treaties

Judicial decisions

State practice

Academic writings

State practice and opinio juris

Treaties and judicial decisions

Legislation and regulations

Custom and usage

By ratification of a treaty

By enactment of legislation

By judicial decision

By consistent and widespread practice

Customary law is a source of international law.

International law is a source of customary law.

Customary law and international law are separate and distinct bodies of law.

Customary law and international law are the same thing.

Yes, by a subsequent customary law.

Yes, by a treaty.

Yes, by judicial decision.

No, it is immutable.

It is the belief that a particular practice is legally binding.

It is the practice of states.

It is the decision of a court.

It is the opinion of a legal scholar.

Customary law is based on state practice and opinio juris, while conventional law is based on treaties.

Customary law is binding on all states, while conventional law is only binding on the states that have ratified the treaty.

Customary law is more flexible than conventional law.

All of the above.

The right of innocent passage through the territorial waters of another state.

The prohibition on the use of force.

The principle of non-intervention.

All of the above.

Customary law can modify or abrogate a treaty.

A treaty can modify or abrogate customary law.

Customary law and treaties are mutually exclusive.

None of the above.

Judicial decisions can help to identify and clarify customary law.

Judicial decisions can create new customary law.

Judicial decisions are not a source of customary law.

None of the above.

Customary law and general principles of law are the same thing.

Customary law is a source of general principles of law.

General principles of law are a source of customary law.

Customary law and general principles of law are separate and distinct bodies of law.

State consent is essential for the creation of customary law.

State consent is not required for the creation of customary law.

State consent is only required for the creation of customary law that is contrary to existing law.

None of the above.

Customary law can modify or abrogate jus cogens.

Jus cogens can modify or abrogate customary law.

Customary law and jus cogens are mutually exclusive.

None of the above.

The lack of a central authority to codify customary law.

The diversity of state practice.

The changing nature of international relations.

All of the above.

Customary law will continue to play an important role in the international legal system.

Customary law will be replaced by conventional law.

Customary law will become obsolete.

None of the above.