Why do applied ethics? -- Some confusions about subjectivity -- What makes choices rational? -- Principles -- Supervenience -- Ontology in ethics -- How to decide moral questions rationally -- Reductio ad absurdum of descriptivism -- Pomising game -- Rawl's Theory of justice -- Structure of ethics and morals -- Relevance -- Ethical theory and utilitarianism -- Utilitarianism and the vicarious affects -- Some reasoning about preferences.