Certainly. Based on the provided legal document, here are the key points summarized:

1. Principle of Including Whole Claim in a Single Suit: A plaintiff must include all reliefs arising from the same cause of action in one suit. Omitting any claim or relief without obtaining leave from the court precludes subsequent claims based on the same cause of action (!) (!) .

2. Same Cause of Action Requirement: For a subsequent suit to be barred under Order II, Rule 2, sub-rule (3), it must be shown that both suits are based on the same cause of action. The cause of action is defined as the factual situation that entitles a person to seek a remedy, including all material facts necessary to support the claim (!) (!) (!) .

3. Test for Identical Cause of Action: The cause of action in both suits must be identical. The cause of action involves the circumstances that infringe upon a right or form the basis for a claim, and it must be the same in both proceedings for the bar to apply (!) (!) .

4. Relief Omission and Leave of Court: If a plaintiff omits to claim certain reliefs available under the same cause of action, they cannot later claim those reliefs unless they obtain leave from the court. This prevents splitting claims and ensures comprehensive litigation (!) (!) .

5. Distinction Between Res Judicata and Order II Rule 2: Res judicata bars relitigation of issues that have been finally decided in a previous case between the same parties, while Order II Rule 2 pertains to the inclusion of all claims and reliefs within a single suit based on the same cause of action. The two principles operate differently but are related in ensuring finality of litigation (!) (!) (!) .

6. Application of the Principle to Specific Cases: The courts have held that if a subsequent suit involves a different cause of action—such as a claim for recovery of possession based on title versus a claim for declaration of rights or improvements—the bar of Order II Rule 2 does not apply. The cause of action must be directly and substantially the same for the rule to be invoked (!) (!) (!) .

7. Claims for Improvements and Bona Fide Belief: A person who comes into possession of land and makes improvements in good faith, believing they are entitled to do so, may be eligible for compensation under relevant statutory provisions. The factual assessment of whether the improvements were made in good faith and the timing of such improvements are crucial for determining entitlement (!) (!) .

8. Remand for Factual Determination: When factual issues such as bona fide belief and the timing of improvements are involved, courts should remand the matter for a fresh factual adjudication, allowing parties to present evidence, to arrive at a just conclusion (!) .

These points collectively emphasize the importance of comprehensively including all claims related to a cause of action in one suit, the necessity of establishing identical cause of action for the application of legal bars, and the consideration of factual circumstances in claims for improvements or possession.