We are pleased to present this English translation of the book Teoría general de obligaciones y contratos. Contratos en particular , by Professors Klaus Jochen Albiez Dohrmann and José Antonio Castillo Parrilla. We have chosen this handbook on obligations and contracts from among the different current handbooks available, as it is a comprehensive and accurate work that is completely up to date. Professors Albiez and Castillo offer a detailed analysis of Spanish law with constant reference to the Civil Code, case law, legal doctrine and, where relevant, European law.