This text aims to present the field of ethics for those students who take only one course in ethics. The section given to historical material and to theories of morality covers only that part which appears to be essential for an understanding of present theories and problems. In addition to the more standard material, the book attempts to link ethics more definitely with the work on human behavior that has been carried on in the various sciences in recent years It also opens up for students the important field of professional and business ethics.