Answer
Three examples of informal amendments to the Constitution are;
• Through court decisions where the court interpret and apply the constitution, for example in cases of unusual punishment.
• Through political parties when they nominate presidential candidates.
• Through customs and traditions which have developed and are not part of the constitution.
Explanation
Informal amendments are not specifically listed by the constitution as forms of amendments to the constitution but they can occur because of change in society or judicial review. The methods depend on interpretations of the meaning of the constitution and the understanding of the intent.