Critical thinking is as much a set of habits and dispositions as a body of knowledge. The intellectual virtues are character traits conducive to good thinking. Intellectual humility recognizes the limits of one's knowledge and the possibility of being wrong. Intellectual honesty requires truthful acknowledgment of evidence and arguments, including those that cut against one's views. Intellectual courage is the willingness to defend unpopular but reasoned conclusions. Intellectual empathy involves putting oneself in another's shoes to understand their reasoning. Intellectual perseverance is the commitment to pursue inquiry despite difficulty. Open-mindedness, the willingness to consider new ideas and revise beliefs, is the counterpart to dogmatism, the rigid holding of beliefs without examining alternatives. Fanaticism, by contrast, is excessive and uncritical zeal for a cause. Intellectual integrity holds oneself to the same standards of evidence one demands of others, and intellectual honesty in disagreement means engaging the actual content of opposing views rather than caricatures. Together, these virtues form the practical backbone of good reasoning.
Critical thinking also requires awareness of how our minds operate. Metacognition is thinking about one's own thinking—monitoring one's reasoning, noticing errors, and adjusting. Kahneman's distinction between System 1 (fast, intuitive, automatic) and System 2 (slow, deliberate, effortful) thinking helps explain why we so often slip into bias: System 1 handles most daily tasks efficiently but is prone to predictable errors, while System 2 can correct these errors at a cost in time and effort. The Socratic method pursues knowledge through systematic questioning, exposing assumptions and refining concepts. The dialectical method advances understanding by contrasting viewpoints. Thought experiments and counterexamples probe ideas by imagining cases: the ship of Theseus asks whether an object remains the same after all its parts are replaced; solipsism pushes the limits of certainty by holding that only one's own mind is sure to exist.
In a world saturated with information, critical thinking demands practical skills. Reading comprehension is the ability to understand and interpret text; bias detection is the recognition of assumptions, perspectives, or interests shaping that text. Fact-checking verifies claims against authoritative sources, lateral reading evaluates a source by checking what others say about it, and source triangulation confirms claims across multiple independent sources. The information ecosystem, however, is shaped by deliberate manipulation. Propaganda is information used systematically, often deceptively, to promote a viewpoint. Censorship is the suppression of information deemed objectionable. Misinformation is false information shared without intent to deceive; disinformation is false information shared with intent to deceive; malinformation is true information shared to cause harm, as in doxxing. Gaslighting manipulates someone into doubting their own perception. The spotlight effect makes us overestimate how much others notice us, while reification, treating an abstract concept as a concrete thing, can lend false solidity to ideas like "the market" or "the people." Against these forces, intellectual integrity is the practical discipline that ties critical thinking to everyday life.