Ethics is a wide field which has contradicting argumentation. This book tries to open the foundations of ethics by the means of philosophical reasoning. It bridges the gap between the argumentation of ethics and the discussions in the philosophy of science. The Author: Friedrich Wallner is Professor Emeritus of Philosophy and Philosophy of Science at the University of Vienna. He has published several books and numerous essays on epistemology and philosophy of science. His concept of constructive realism is of great interest in discussions on the philosophy of science. This book spans an arc from ethics to philosophy of science and back.