THE FIELD OF PHILOSOPHY
Traditional Subfields of Philosophy
The broadest subfields of philosophy are most commonly taken to be logic, ethics, metaphysics, epistemology and the history of philosophy. Here is a brief sketch of each.
Logic is concerned to provide sound methods for distinguishing good from bad reasoning. It helps us assess how well our premises support our conclusions, to see what we are committed to accepting when we take a view, and to avoid adopting beliefs for which we lack adequate reasons. Logic also helps us to find arguments where we might otherwise simply see a set of loosely related statements, to discover assumptions we did not know we were making, and to formulate the minimum claims we must establish if we are to prove (or inductively support) our point.
Ethics takes up the meanings of our moral concepts such as right action, obligation and justice–and formulates principles to guide moral decisions, whether in private or public life. What are our moral obligations to others? How can moral disagreements be rationally settled? What rights must a just society accord its citizens? What constitutes a valid excuse for wrong-doing?
Metaphysics seeks basic criteria for determining what sorts of things are real. Are there mental, physical, and abstract things (such as numbers), for instance, or is there just the physical and the spiritual, or merely matter and energy? Are persons highly complex physical systems, or do they have properties not reducible to anything physical?
Epistemology concerns the nature and scope of knowledge. What does it mean to know (the truth), and what is the nature of truth? What sorts of things can be known, and can we be justified in our beliefs about what goes beyond the evidence of our senses, such as the inner lives of others or events of the distant past? Is there knowledge beyond the reach of science? What are the limits of self-knowledge?
The History of Philosophy studies both major philosophers and entire periods in the development of philosophy such as the Ancient, Medieval, Modern, Nineteenth Century, and Twentieth Century periods. It seeks to understand great figures, their influence on others, and their importance for contemporary issues. The history of philosophy in a single nation is often separately studied, as in the case of American Philosophy. So are major movements within a nation, such as British Empiricism and German Idealism, as well as international movements with a substantial history, such as existentialism and phenomenology. The history of philosophy not only provides insight into the other subfields of philosophy; it also reveals many of the foundations of Western Civilization.