The doctrine of Stare Decisis 

The authority of judicial precedents is based on the doctrine of stare decisis. The term stare decisis means to not disturb the undisturbed. In other words, precedents that have been valid for a long time must not be disturbed. 

In India, subordinate courts are bound by the precedents of higher courts, and higher courts are bound by their own precedents. But when it comes to High Courts, the decision of one High Court is not binding on the other High Courts. Their decisions are binding on the subordinate courts. In cases where there are conflicts between decisions of court with the same authority, the latest decision is to be followed. As per Article 141 of the Constitution of India, the Supreme Court’s decisions are binding on all the courts across the country. However, the Supreme Court’s decisions are not binding on itself. In subsequent cases where there are sufficient reasons to deviate from the earlier decision, the Supreme Court can do so. 

Doctrine of Res Judicata 

The term res judicata means subject matter adjudged. As per this doctrine, once a lawsuit has been decided upon, the parties are barred from raising the same issue in courts again, unless new material facts have been discovered. They can’t raise another issue arising from the same claim either since they could have raised the same in the previous suit. 

Ratio Decidendi 

As per Salmond, a precedent is a judicial decision that contains a legal principle with an authoritative element called ratio decidendi. Ratio decidendi means reason for the decision. Whenever a judge gets a case to decide on, he has to adjudicate it even when there is no statute or precedent concerning it. The principle that governs such a decision is the reason for the decision which is also called ratio decidendi. 

Obiter Dicta 

The term obiter dictum means mere say by the way. This term is used to refer to statements of law that are not required for the case at hand. A judge may in the judgement of a case declare some legal principles to be applied in a hypothetical situation. It does not have much impact or authority. However, the subordinate courts are bound to apply the principles.