Introduction
The phrase “who knows what” is a recurring motif in the philosophical study of knowledge, or epistemology. It encapsulates the inquiry into the limits and contents of human understanding, asking not only what knowledge exists but also who possesses it and in what form. Over the centuries, thinkers have explored this question from multiple angles - analytically, empirically, and logically - yielding a rich body of literature that spans ancient Greek philosophy, medieval scholasticism, modern analytic philosophy, and contemporary cognitive science. This article surveys the historical development, key concepts, and ongoing debates surrounding the problem of knowing what, and illustrates its relevance to diverse disciplines such as artificial intelligence, information theory, and the philosophy of mind.
Historical Background
Ancient Foundations
In the classical period, the Greeks were preoccupied with the nature of knowledge and certainty. Plato’s dialogues, particularly the Republic and the Statesman, introduce the idea that true knowledge requires an apprehension of the Forms, immutable ideals that ground empirical reality. Socrates, through the method of elenchus, sought to expose the ignorance of his interlocutors, famously claiming that “I know that I know nothing” (Apology 38b). The epistemic humility implicit in this statement foreshadows the contemporary concern that we may not know what we think we know.
Aristotle advanced the concept of “epistēmē,” a kind of knowledge distinguished from mere belief (“doxa”). In Posterior Analytics, he proposes that knowledge consists of a justified true belief, a proposition that is both demonstratively supported and empirically verified. This classical tripartite definition has shaped epistemic discussions for nearly two millennia.
Medieval Scholasticism
During the Middle Ages, Christian philosophers such as Augustine and Thomas Aquinas merged Aristotelian epistemology with theological doctrine. Augustine’s interiority of thought, as expressed in his Confessions, raised the question of whether self‑knowledge could be certain. Aquinas, in the Summa Theologica, developed a nuanced view of knowledge that includes faith, which he distinguishes from human reason but also acknowledges its epistemic significance.
Enlightenment and Rationalism
The 17th and 18th centuries witnessed a surge in systematic attempts to delineate the scope of human knowledge. René Descartes, in his Discourse on Method, famously employed methodological doubt to arrive at the foundational certainty that “I think, therefore I am.” His subsequent investigations into clear and distinct ideas further clarified the relationship between cognition and reality.
John Locke, in An Essay Concerning Human Understanding, argues that all knowledge originates from sensory experience, but he also distinguishes between “ideas” of the mind and “objects” of the world, thereby laying the groundwork for debates over direct versus indirect perception.
19th–Early 20th Century Developments
Immanuel Kant’s Critique of Pure Reason introduced a critical epistemology that separates phenomena (the world as experienced) from noumena (the world as it is in itself). Kant’s distinction between a priori and a posteriori knowledge reshaped discussions of what can be known independently of experience.
David Hume’s empirical skepticism challenged the possibility of causal knowledge, demanding a more cautious attitude toward what we claim to know. His arguments against induction illustrate the limitations of human inference, echoing the “who knows what” question in the context of scientific knowledge.
Contemporary Analytic and Cognitive Approaches
In the 20th century, analytic philosophers like Ludwig Wittgenstein, Karl Popper, and Edmund Gettier revisited the justified true belief model. Wittgenstein’s Philosophical Investigations questioned the very possibility of an objective, fixed meaning of knowledge, suggesting that knowing what is a matter of practice and language games.
Gettier’s 1963 paper, “Is Justified True Belief Knowledge?” introduced cases that undermine the classic definition, prompting the development of alternative accounts such as virtue epistemology and reliabilism.
Parallel to these philosophical developments, cognitive science emerged as an empirical discipline investigating mental representation, perception, and decision-making. Studies of heuristics, biases, and the Bayesian brain have shown that human knowledge is often probabilistic and context‑dependent, complicating the notion of definitive “knowing what.”
Key Concepts in the Problem of Knowing What
Knowledge as Justified True Belief
The tripartite model posits that knowledge requires: (1) a belief; (2) truth; and (3) justification. Though widespread, this model faces challenges such as the Gettier problem, which demonstrates that having justified true belief does not guarantee knowledge in all cases.
Justification Theories
Justification can be understood through several frameworks:
- Coherentism: justification arises from the coherence of a belief system.
- Foundationalism: justification rests on basic beliefs that do not require further support.
- Reliabilism: knowledge is a product of reliable cognitive processes.
- Virtue Epistemology: knowledge depends on the intellectual virtues of the knower.
Each theory offers a different answer to “who knows what” by specifying criteria for the reliability or coherence of knowledge claims.
Types of Knowledge
Knowledge is traditionally divided into three main categories:
- Declarative (Propositional) Knowledge: knowledge of facts, often expressed as "knowing that" statements.
- Procedural Knowledge: knowledge of how to perform actions, expressed as "knowing how" statements.
knowledge gained through direct experience, sometimes called tacit or implicit knowledge.
Distinguishing these types helps clarify which form of knowledge is implicated in epistemic inquiries.
The Epistemic Status of Others’ Knowledge
Epistemology also investigates how we attribute knowledge to others. Theories of social epistemology address issues such as collective knowledge, epistemic injustice, and the distribution of epistemic authority. Questions arise about the validity of testimony, the conditions for shared understanding, and the role of expertise.
Epistemic Logic and Modal Operators
Epistemic logic formalizes knowledge using modal operators. In a system where \(K_i \varphi\) denotes “agent \(i\) knows that \(\varphi\),” one can analyze statements such as “agent \(i\) knows that agent \(j\) knows \(\varphi\)” and explore nested knowledge. This formalism aids in modeling distributed systems, communication protocols, and multi-agent reasoning.
Applications and Interdisciplinary Connections
Artificial Intelligence and Knowledge Representation
In AI, representing what a system knows involves ontologies, knowledge graphs, and belief revision mechanisms. The distinction between declarative and procedural knowledge is vital for designing intelligent agents capable of reasoning and acting. The challenge of “who knows what” is central to ensuring that knowledge bases are coherent and that agents can assess their own epistemic states.
Information Theory and Signal Processing
Claude Shannon’s information theory quantifies uncertainty and conveys the amount of information transmitted. In this context, knowing what translates to reducing uncertainty about a signal. The study of entropy and mutual information helps in designing efficient communication systems where the sender and receiver share a common knowledge base.
Cognitive Science and Human Decision Making
Psychological experiments on heuristics and biases illustrate how people approximate knowledge under cognitive constraints. The “representativeness” and “availability” heuristics often lead to systematic errors, suggesting that humans operate with probabilistic knowledge rather than absolute certainty.
Legal Theory and Evidentiary Standards
Law relies heavily on the epistemic claims of witnesses, experts, and documents. The standards of proof - preponderance of evidence, clear and convincing evidence, beyond a reasonable doubt - reflect differing thresholds for what constitutes knowledge in legal contexts.
Education and Pedagogical Practices
Educational theory examines how students acquire declarative and procedural knowledge and how instructors can facilitate epistemic growth. The Socratic method, formative assessment, and collaborative learning are all strategies aimed at clarifying what learners know and how they know it.
Ethics and Epistemic Responsibility
Epistemic ethics addresses the moral obligations of individuals and institutions to seek truth, avoid deception, and acknowledge ignorance. The notion of epistemic humility has gained prominence in discussions of scientific integrity, journalism, and public policy.
Philosophical Debates and Critiques
The Gettier Problem and Its Proposals
Gettier’s counterexamples reveal that justified true belief may fail to qualify as knowledge. In response, philosophers have offered:
- Knowledge as True Belief with a No False Lemma (NFL): a stricter condition requiring no false premises in the justification chain.
- Reliabilist Accounts: knowledge is a belief produced by a reliable cognitive process.
- Virtue Epistemology: knowledge requires the agent’s intellectual virtues such as open‑mindedness.
Internalism vs. Externalism
The debate over whether justification must be accessible to the subject (internalism) or can rely on external factors (externalism) remains central. Internalist theories emphasize introspective awareness, while externalist positions stress the reliability of belief‑generating processes.
Contextualism and Epistemic Relativism
Contextualism posits that the truth conditions of knowledge claims vary with context. In ordinary contexts, a belief may be considered knowledge, whereas in “knowledge‑rich” contexts it may fail to meet higher standards. Epistemic relativism further argues that knowledge is relative to cultural or individual frameworks.
Social Epistemology and Collective Knowledge
Issues such as epistemic injustice, informational inequality, and the dynamics of consensus formation raise questions about who has the authority to declare knowledge. The concept of “epistemic injustice” (Fricker, 2007) captures the harm done when certain groups are denied epistemic credit.
Future Directions
Artificial General Intelligence and Self‑Aware Agents
As AI systems advance toward general intelligence, the capacity to introspect about their own knowledge states becomes crucial. Formalizing “knowing what” in machine agents will require integration of epistemic logic, metacognition, and explainable AI.
Interdisciplinary Methodologies
Collaborations between philosophers, cognitive scientists, computer scientists, and educators promise richer models of knowledge acquisition and representation. Empirical studies of reasoning patterns can inform philosophical theories of justification.
Global Epistemic Governance
In an age of misinformation, establishing global standards for credible knowledge becomes a pressing challenge. Policy frameworks that address epistemic accountability could mitigate the spread of false claims.
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