1. The document defines and describes the different elements and kinds of obligations under Philippine contract law. It identifies the active subject, passive subject, efficient cause, and object as the elements of an obligation.
2. It categorizes obligations based on their source according to the New Civil Code, including those arising from law, contracts, quasi-contracts, acts or omissions punished by law, and quasi-delicts. Quasi-contracts include negotiorum gestio and solutio indebiti.
3. The document also outlines the different types of obligations based on criteria like the subject matter, affirmativeness/negativeness, and persons obliged