1. OBLIGATION
1.1. Obligations arise from
1.1.1. law
1.1.2. contracts
1.1.3. quasi-contracts
1.1.4. acts or omissions punished by law
1.1.5. quasi-delicts
1.2. Nature and Effect
1.3. Kinds of Obligations
1.3.1. Pure and Conditional
1.3.2. Obligations with a Period
1.3.3. Alternative
1.3.4. Joint and Solidarity
1.3.4.1. Joint Obligation
1.3.4.2. Solidarity Obligation
1.3.4.2.1. According to Parties Bound
1.3.4.2.2. According to Source
1.3.5. Divisible and Indivisible
1.3.6. Obligations with a Penal Clause
1.4. Extinguishment of Obligations
1.4.1. Payment for Performance
1.4.1.1. Application of Payments
1.4.1.2. Payment by Cession
1.4.1.3. Tender of Payment and Consignation
1.4.2. Loss of the thing due
1.4.3. Condonation or Remission of the debt
1.4.4. Confusion or Merger of Rights
1.4.5. Compensation
1.4.6. Novation
1.4.6.1. Changing their object
1.4.6.2. Substituting the person of the debtor
1.4.6.3. Subrogating a third person in the rights of the creditor
1.5. Natural Obligations
1.5.1. Civil
1.5.2. Natural
2. CONTRACTS
2.1. Essential Requisites
2.1.1. Consent
2.1.1.1. Unemancipated minors
2.1.1.2. Insane or demented persons
2.1.1.3. Deaf mutes
2.1.2. Object of Contracts
2.1.3. Cause of Contracts