Area of knowledge (AOK) A distinct domain of knowledge with its own methods, assumptions, and standards of evidence. The five AOKs are the arts, history, human sciences, mathematics, and the natural sciences.

The arts The AOK concerned with creative expression, aesthetic experience, and the production of meaning through artistic works.

Assumption A belief accepted without examination or justification, often so deeply held that we are unaware we are making it.

Bias A systematic tendency to favour certain conclusions, perspectives, or sources of evidence over others, often unconsciously.

Certainty (KC) The degree to which a knowledge claim can be held without doubt. TOK asks whether certainty is ever fully attainable, or whether all knowledge is provisional.

Claim A statement presented as true, which may or may not be supported by adequate evidence or justification.

Coherence The degree to which a set of beliefs or knowledge claims fit together consistently without contradiction.

Confirmation bias The tendency to seek out and accept information that confirms what we already believe, and to dismiss evidence that challenges it.

Consensus Agreement among a community of knowers, often used as a basis for accepting a knowledge claim as reliable.

Counterclaim A claim that challenges or qualifies another claim, used in TOK to explore the complexity and limitations of knowledge.

Culture (KC) The shared beliefs, values, practices, and ways of knowing that characterise a particular community or group, and that shape what its members accept as true or meaningful.

Disciplinary knowledge Knowledge produced within a specific academic field, using that field’s particular methods and frameworks.

Doubt The questioning of a knowledge claim, which TOK treats as an essential starting point for genuine critical thinking.

Echo chamber An environment in which a person encounters only information and opinions that reinforce their existing beliefs.

Empirical knowledge Knowledge derived from observation and sensory experience rather than pure reasoning or speculation.

Evidence (KC) The information or data used to support or challenge a knowledge claim. TOK asks what counts as good evidence, and how this differs across areas of knowledge.

Exhibition One of the two TOK assessment components, in which students select three real-world objects and connect them to a single exhibition prompt.

Explanation (KC) An account of why or how something is the case. TOK examines what makes an explanation satisfying, reliable, or adequate across different disciplines.

Fact A claim generally accepted as true on the basis of evidence, though TOK encourages scrutiny of how facts are established and who establishes them.

Fallacy A flawed or invalid form of reasoning that leads to an unreliable conclusion.

Framework A set of concepts, assumptions, or principles that structures how we approach and understand a particular area of knowledge.

History The AOK concerned with knowledge of the past, including how historical accounts are constructed, interpreted, and revised over time.

Human sciences The AOK concerned with the systematic study of human behaviour and society, including psychology, economics, sociology, and anthropology.

Hypothesis A provisional claim or explanation put forward for testing, particularly in the natural sciences.

Ideology A system of ideas and values that shapes how a group or society understands the world and justifies its beliefs and actions.

Indigenous societies An optional TOK theme exploring how indigenous communities produce, preserve, and transmit knowledge, and how those knowledge systems relate to and challenge dominant Western frameworks.

Interpretation (KC) The process of making meaning from evidence, texts, or experience. TOK asks whether interpretation can ever be fully objective.

Justification (KC) The reasons or evidence offered in support of a knowledge claim. TOK asks what counts as sufficient justification across different areas of knowledge.

Knowledge and the knower The core TOK theme, exploring how the identity, background, culture, and perspective of the knower shapes what they know and how they come to know it.

Knowledge claim A statement that asserts something is known or true, and which can be examined, challenged, and evaluated.

Knowledge framework A structured way of analysing an area of knowledge, examining its scope, methods, key concepts, and historical development.

Language An optional TOK theme exploring how the words, structures, and metaphors we use shape what we are able to think, communicate, and know.

Mathematics The AOK concerned with abstract structures, patterns, and proofs, raising questions about certainty, universality, and the relationship between mathematics and reality.

Metacognition Thinking about thinking — the reflective awareness of one’s own reasoning processes, central to the TOK approach.

Methodology The set of methods and principles used within a discipline to produce reliable knowledge.

Natural sciences The AOK concerned with the empirical study of the natural world, including biology, chemistry, and physics.

Objectivity (KC) The ideal of knowledge that is free from personal bias or perspective. TOK asks whether genuine objectivity is ever fully achievable.

Paradigm A dominant framework of assumptions and methods within a discipline, which shapes what questions are asked and what counts as a valid answer.

Personal knowledge Knowledge derived from individual experience, reflection, and perspective, as distinct from shared or disciplinary knowledge.

Perspective (KC) The particular viewpoint from which a knower approaches the world, shaped by culture, experience, language, and values.

Politics An optional TOK theme examining how political power, ideology, and institutional interests shape what is accepted as knowledge and whose knowledge is recognised.

Power (KC) The ability to influence what is accepted as knowledge, whose knowledge is recognised, and how knowledge is produced and distributed.

Prescribed title (PT) One of six essay titles set each examination cycle, to which TOK students respond in their 1,600-word essay.

Religion An optional TOK theme exploring how religious traditions produce and validate knowledge, and how religious and scientific frameworks relate to and sometimes challenge each other.

Relativism The view that knowledge, truth, or morality is not universal but always relative to a particular culture, perspective, or framework.

Reliability The degree to which a knowledge claim or source can be consistently trusted to produce accurate results.

Responsibility (KC) The ethical obligations that come with producing, sharing, or acting on knowledge. TOK asks what we owe to others as knowers.

Shared knowledge Knowledge produced and validated collectively within communities or disciplines, as distinct from personal knowledge.

Scepticism The philosophical position that questions whether certain or reliable knowledge is possible, used in TOK as a productive tool for examining claims.

Technology An optional TOK theme exploring how technological tools and systems shape the production, communication, and reliability of knowledge, and raise new ethical questions about its use.

Truth (KC) The property of a knowledge claim that accurately corresponds to reality. TOK examines different theories of truth and asks whether truth is ever fully attainable.

Values (KC) The principles and standards that guide judgement and action. TOK examines how values shape what we regard as knowledge and how we produce it.