Physical objects: Materialism, Realism, Idealism, Aristotelianism, Cartesianism
Mental events: Dualism, Monism, Epiphenomenalism, Behaviorism, Cognitive psychology
Social interactions: Social contract theory, Communitarianism, Libertarianism, Utilitarianism, Rawlsianism
Ethical dilemmas: Deontology, Consequentialism, Virtue ethics, Kantianism, Utilitarianism
Cosmological phenomena: Theism, Pantheism, Atheism, Naturalism, Panpsychism