I. Introduction. The Obligation. The Rendering. Complex Obligational Relationship. The role of Obligation. Obligations and rights in rem. Systematic principles of Contracts Law. the principle of private autonomy; the principle of good faith, the principle of non unjust enrichment. II. Sources of obligations. Contracts. Unilateral acts. 'Negotiorium Gestio'. Unjust enrichment. Civil liability. Contractual responsibility. Extracontractual responsibility: torts, risk activities liability and responsibility for lawful acts. III. Kind of obligations. About the lien: natural and civil obligations. About the parties: conjuntive obligations and joint and several obligations. About the object. IV. Transmission of Obligations. Credit and Debits transmission. Credits assignment. Subrogation. Single transmission of debts. Assignment of contractual position. V. General Security of Obligations. Means for the maintenance of Patrimonial Security. Nullity declaration. Creditor subrogation over the

CILO-1: This course aims to provide students an introduction to obligations general theory and basic concepts, and in special the sources of obligations, as contracts and civil liability, and other issues as transfer, security, and performance and non performance of obligations, fundamental for the understanding and pursuing the studies of civil patrimonial and private law and legal practice.