This document discusses different philosophical methods for determining truth, including phenomenology, existentialism, postmodernism, and logic. Phenomenology views truth as based on one's consciousness. Existentialism sees truth as exercising personal freedom and choice. Postmodernism rejects the idea of absolute truth, viewing truth as culturally constructed. Logic and critical thinking use reasoning and identifying fallacies to evaluate arguments. The document provides examples of deductive and inductive reasoning as well as common logical fallacies.