Offers the view that only an interdisciplinary view grounded in the impartial method of scientific inquiry can hope to develop moral principles and rules of action appropriate to today's world. Daleiden, a lecturer and author, argues that only a scientific understanding of human nature in conjunction with a rigorous empirical analysis of human behavior and its consequences can provide a basis for formulating sets of norms best suited to society's needs. He reviews various systems of ethics, from those proposed by the ancient Greeks to the theories of 20th-century thinkers, in his discussion of modern ethical issues such as abortion, capital punishment, euthanasia, drug use, sexual behavior, and pornography. Annotation c. by Book News, Inc., Portland, Or.