"the thing has been decided" The principle that a final judgement of a competent court is conclusive upon the parties in any subsequent litigation involving the same cause of action.
The Doctrine of Res-judicata is based on the following three maxims:
1. Nemo Debet Lis Vexari Pro Una Et Eaden Causa – No man should be vexed twice over for the same cause;
2. Interest Republicate Ut Sit Finis Litium- It is in the interest of the State that there should be an end to a litigation; and
3. Res Judicata Pro Veritate Occipitur – A judicial decision must be accepted as correct.
The doctrine of Res Judicata has been explained in the simplest possible manner by Das Gupta, J., in the case of Satyadhyan vs. Smt. Deorajin Debi in the following words:
The Doctrine of Res-judicata is based on the following three maxims:
1. Nemo Debet Lis Vexari Pro Una Et Eaden Causa – No man should be vexed twice over for the same cause;
2. Interest Republicate Ut Sit Finis Litium- It is in the interest of the State that there should be an end to a litigation; and
3. Res Judicata Pro Veritate Occipitur – A judicial decision must be accepted as correct.
The doctrine of Res Judicata has been explained in the simplest possible manner by Das Gupta, J., in the case of Satyadhyan vs. Smt. Deorajin Debi in the following words:

