This book presents a clear and critical view of the orthodox logical empiricist tradition, pointing the way to significant developments for the understanding of science both as research and as culture. It summarizes the present confused and highly polarized status of the orthodox philosophy of science. It exhibits clearly the fundamental metaphysical and global presuppositions and confusions that have led to this status. It provides a positive point of view from which progress can be made toward understanding science as research done by real scientists rather than science as exemplifying some prior epistemological program created by philosophers. And it leads directly to an understanding of science as a dynamic force within our society with consequences for the environment and public policy.