In administrative law, the principle of 'audi alteram partem' (hear the other side) is an essential component of which doctrine?

Audi alteram partem (hear the other side) is one of the two foundational pillars of the principles of natural justice, the other being nemo judex in causa sua (no one should be a judge in their own cause). This principle requires that before any adverse action is taken against a person, he must be given a reasonable opportunity of being heard-notice of the proposed action, an opportunity to present his case, and a reasoned decision. The Supreme Court in Maneka Gandhi v. Union of India (1978) held that the principles of natural justice are an integral part of Article 14 (right to equality) and Article 21 (right to life and personal liberty) of the Constitution. Even where a statute is silent on the requirement of hearing, the principle is implied unless expressly excluded by the statute or impliedly excluded by the nature of the action.