Custom is the primary source of customary law. It refers to the long-standing practices and beliefs that are followed by a particular community or group of people.

The three main elements of a valid custom are antiquity (it must have been in existence for a long time), continuity (it must have been consistently followed over time), and certainty (it must be clear and unambiguous).

Legislation is not a source of customary law. Customary law is based on the customs and practices of a particular community or group of people, while legislation is created by a legislative body.

Judicial precedent contributes to the development of customary law by recognizing and enforcing customs. When a court recognizes and enforces a custom, it gives it legal validity and makes it binding on the parties involved.

Legal maxims provide general principles of law that can be applied to a variety of situations. They help to interpret and clarify customs and can also be used to create new customs.

In general, statutory law prevails over customary law. This means that if there is a conflict between a statute and a custom, the statute will take precedence.

Customary law can be changed by both legislation and judicial precedent. Legislation can override customary law, and judicial precedent can interpret and clarify customary law, which can lead to changes in the way it is applied.

All of the above are challenges associated with the application of customary law. It can be difficult to prove the existence of a custom, to determine its scope and extent, and to reconcile different customs that apply to the same situation.

All of the above are advantages of customary law. It is flexible and adaptable, it is based on the customs and practices of a particular community, and it is often more efficient and less costly than formal law.

The future of customary law is difficult to predict. It is likely that it will continue to play an important role in many societies, but it is also possible that it will be replaced by formal law or become less relevant as societies become more globalized.