Through various examples and diagrams the work introduces students and practitioners to the most prominent rules of the law of obligation. Additionally their systematic relation to the German civil law is laid out. The most important legal issues implying different forms of contract - from an agreement of sale, a hiring contract to a tourist travel contract - are explained comprehensively on a legal and practical basis. An audio version of the work as well as cases, legal texts, charts, diagrams and multiple choice tests are included on a CD.