Theory of Knowledge (TOK): The Complete Teacher's Guide (2026)

What Theory of Knowledge Really Is

Theory of Knowledge (TOK) is a compulsory component of the International Baccalaureate Diploma Programme that asks students to examine the nature of knowledge itself. Rather than teaching new subject content, TOK challenges students to question how we know what we claim to know across disciplines as different as mathematics, history, and the arts. The central question driving every TOK lesson is: "How do you know?" (IB Organisation, 2022).

TOK sits within the DP Core alongside the Extended Essay and Creativity, Activity, Service. Together, these three components can contribute up to 3 bonus points to a student's final IB Diploma score, making TOK results directly consequential for university entry. Teachers unfamiliar with epistemology sometimes underestimate this course; in practice, it is one of the most demanding and rewarding components of the entire Diploma Programme.

At its heart, TOK builds critical thinking skills by asking students to reflect on the methods, assumptions, and limitations of knowledge production in every discipline they study. A physicist asking whether a model is "true" or merely useful, a historian questioning whose perspective dominates a primary source, a mathematician wondering whether numbers are discovered or invented: these are TOK moments embedded across the curriculum.

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The Knowledge Framework

The Knowledge Framework is the primary analytical tool of the 2022 TOK syllabus. It provides a structured set of four lenses through which students examine any Area of Knowledge or Theme. Teachers should think of it as the equivalent of a scientific method for knowledge itself: a repeatable process that makes inquiry rigorous and comparative rather than impressionistic (IB Organisation, 2022).

The four elements of the Knowledge Framework are:

Scope, What does this area of knowledge deal with? What kinds of claims does it make, and what falls outside its boundaries? In the natural sciences, scope includes empirically testable claims about the physical world. In the arts, scope extends to aesthetic and expressive dimensions that resist empirical testing.

Perspectives, Whose voices shape knowledge in this area? How do cultural, historical, and individual standpoints influence what counts as valid knowledge? History is an especially rich AOK for perspectives work: two historians examining the same event may produce radically different accounts depending on the sources available to them and the questions they bring.

Methods and Tools, How is knowledge produced, validated, and communicated in this area? The natural sciences rely on hypothesis testing, replication, and peer review. Mathematics relies on deductive proof. The arts use demonstration, performance, and critical reception. Comparing methods across AOKs reveals where certainty is possible and where it is not.

Ethics, What are the responsibilities of those who produce, share, or apply knowledge in this area? Human sciences face ethical constraints around experimentation with people. Technology raises questions about data privacy and algorithmic accountability. No AOK is ethically neutral.

In the classroom, the Knowledge Framework is most effective when students apply all four lenses to the same real-world situation. For example, a news story about CRISPR gene editing can be examined through scope (what does biology claim it can do?), perspectives (which communities benefit and which bear the risk?), methods (how was the evidence gathered?), and ethics (who should decide what edits are permissible?).

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The Core Theme: Knowledge and the Knower

Every student in the 2022 syllabus studies the Core Theme. "Knowledge and the Knower" explores how personal identity, cultural background, lived experience, and cognitive processes shape what we are able and willing to know. It is, in effect, the metacognitive layer of TOK: before examining any AOK, students examine themselves as knowers.

Key questions for the Core Theme include: How do prior beliefs filter the evidence we accept? In what ways does cultural background shape which knowledge is valued? How do emotions, intuitions, and language influence reasoning? These questions connect directly to classroom work on metacognition: the more aware students are of their own thinking, the more honest their epistemological inquiry becomes.

Bias and objectivity sit at the centre of this theme. Cognitive biases, confirmation bias in particular, mean that even trained researchers selectively attend to evidence that supports existing beliefs. The Core Theme asks students to examine this not as a personal failing but as a structural feature of how human knowledge works. A classroom activity that works well here: ask students to evaluate the same study as a proponent and a sceptic of its conclusion, then compare the arguments they generated from each position.

This theme also addresses the distinction between personal knowledge and shared knowledge. A student's own fear of spiders is personal knowledge; the evolutionary account of why humans developed a fear of predatory animals is shared, public, and (in principle) revisable through further research. Understanding this distinction helps students see why subjective experience, while real and valid, cannot by itself settle questions of fact.

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The Five Optional Themes

Schools must choose exactly two Optional Themes to study alongside the Core Theme. Each Optional Theme examines the Knowledge Framework through a specific contemporary lens, giving TOK direct relevance to issues students encounter outside the classroom (IB Organisation, 2022).

Knowledge and Technology, How does digital technology alter what we know, how we know it, and who controls knowledge? Questions include algorithmic curation of information, deepfakes and epistemic trust, and the knowledge claims made by artificial intelligence systems. This theme is increasingly urgent: students entering university today have grown up in an information environment shaped by recommendation algorithms they cannot inspect.

Knowledge and Language, How does the language we use shape the knowledge we can express? Students explore linguistic relativity, the power of naming and categorisation, how translation loses nuance across cultures, and the way metaphor shapes how we reason about abstract concepts. The Sapir-Whorf hypothesis provides a useful starting point for debate about strong versus weak versions of linguistic determinism.

Knowledge and Politics, Who controls what counts as knowledge, and who benefits? This theme examines propaganda, scientific consensus and its denial, the role of institutional authority in validating knowledge claims, and the politics of history curricula. Students are asked to consider cases where political power and epistemological authority come into direct conflict.

Knowledge and Religion, What kinds of knowledge do religious traditions claim to offer? How do faith-based and evidence-based approaches to knowledge coexist, clash, or complement one another? Students are not asked to adjudicate between religious and scientific worldviews but to understand the different methods and standards of justification each employs.

Knowledge and Indigenous Societies, How have indigenous knowledge systems contributed to and been marginalised within dominant knowledge traditions? This theme examines land knowledge, oral history, and ecological understanding developed over generations, and asks what is lost when these are excluded from formal education. It pairs well with discussions of historiography, perspective, and the ethics of knowledge extraction.

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The Five Areas of Knowledge

Areas of Knowledge (AOKs) are the disciplinary fields through which students apply the Knowledge Framework. The 2022 syllabus identifies five. Students are expected to use at least two different AOKs in their TOK Essay, and the Exhibition must connect to real-world situations that can be analysed through the lens of any AOK. Teaching each AOK well means going beyond content to examine the methods, assumptions, and limits of that discipline.

Natural Sciences

The natural sciences produce knowledge through empirical observation, hypothesis formulation, controlled experimentation, and peer-reviewed publication. The key epistemological concepts here are falsifiability (Karl Popper's criterion that a scientific claim must be testable and disprovable) and paradigm shifts (Thomas Kuhn's observation that science does not progress purely linearly but undergoes periodic revolutions when anomalies accumulate). Students should understand that scientific consensus, while the most reliable form of empirical knowledge we have, is always provisional. A strong TOK classroom activity: compare the original and revised models of the atom, discussing what changed, what stayed, and why the revisions were accepted.

Human Sciences

The human sciences, including psychology, economics, sociology, and anthropology, face a distinctive methodological challenge: the observer effect. Unlike electrons or geological strata, human subjects are aware they are being studied, and this awareness changes their behaviour. The ethics of experimentation in human sciences are also demanding: Milgram's obedience studies produced significant knowledge but would not receive ethical approval today. Students can examine the tension between the desire for scientific rigour and the ethical constraints that necessarily limit what human scientists can do.

History

Historical knowledge is constructed from incomplete and perspective-laden sources. No historian has direct access to the past; every account is mediated by available evidence, the questions the historian brings, and the cultural moment in which the history is written. Historiography, the study of how historical accounts are produced and contested, is directly relevant here. A productive classroom exercise: ask students to find two accounts of the same historical event from different national curricula and identify what each emphasises, omits, and assumes. This makes the concept of perspective visceral rather than abstract.

Mathematics

Mathematics occupies a unique epistemological position. Mathematical truths appear to be certain and non-empirical: the Pythagorean theorem does not depend on measuring actual triangles. Yet mathematicians disagree about what mathematics is: is it discovered (do mathematical objects exist independently of human minds?) or invented (is it a formal language we have constructed?)? The reliability of mathematical proof, the role of axioms as starting assumptions that cannot themselves be proved, and the paradoxes discovered by Gödel are rich TOK territory. Students are often surprised to learn that mathematics has limits: Gödel's Incompleteness Theorems show that in any sufficiently complex formal system, there are true statements that cannot be proved within that system.

The Arts

The arts present a challenge to any theory of knowledge that equates knowing with propositional, verifiable claims. A painting or a piece of music carries knowledge, but not in the form of testable propositions. The arts produce understanding through emotional resonance, aesthetic experience, symbol, and narrative. Key TOK questions for the arts include: Can there be expertise in artistic interpretation, or is all response equally valid? How do cultural conventions shape what a work of art means? In what sense does a novel "tell us something true" about human experience? Students who engage seriously with the arts in TOK often find that it reshapes their view of what counts as knowledge in the sciences too.

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Knowledge Questions: The Engine of TOK Inquiry

A Knowledge Question (KQ) is an open-ended, contestable question about the nature of knowledge rather than about subject-specific content. The distinction matters. "What caused the First World War?" is a historical question. "To what extent do historians' present-day assumptions determine which causes they identify as primary?" is a Knowledge Question. KQs do not have single correct answers; they require analysis of competing perspectives, evidence, and standards of justification (van de Lagemaat, 2015).

Well-formed Knowledge Questions share three features. First, they are explicitly about knowledge: they typically contain phrases such as "How do we know?", "To what extent?", "What counts as?", or "In what ways does?". Second, they are open and contestable: a thoughtful student can argue multiple positions and produce genuine disagreement. Third, they connect to real-world situations, grounding abstract epistemological inquiry in concrete cases.

In the classroom, a practical approach is to use the Knowledge Framework to generate KQs systematically. For any real-world situation, ask: What does each AOK claim about this? Whose perspectives are present or absent? What methods were used to produce this knowledge? What ethical issues does this raise? Each of these prompts can yield a genuine KQ. The Thinking Framework's cognitive operations are useful here: the Compare operation generates questions about methodology across AOKs; the Cause and Effect operation generates questions about how knowledge claims are produced and revised; the Perspective operation generates questions about whose knowledge is centred.

Common student errors in KQ writing: treating factual questions as KQs (these have answers, not arguments), writing questions that are too broad to be answered in 1,600 words, and failing to connect the KQ to a specific AOK or Theme. Teachers should model KQ generation explicitly, showing the thought process rather than just presenting finished examples.

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Claims and Counterclaims: The Core Skill

The ability to construct claims and counterclaims is the foundational skill of both the TOK Essay and productive TOK classroom discussion. A claim is a statement about knowledge that can be supported with evidence and argument. A counterclaim challenges, qualifies, or limits that statement, typically by bringing in a different perspective, context, or AOK. The interplay between claim and counterclaim is what makes TOK essays genuinely argumentative rather than descriptive.

The basic structure for TOK essay paragraphs is: state a claim, provide a real-world example or evidence to support it, then introduce a counterclaim that complicates or qualifies it, with its own supporting example. Students are often tempted to resolve the tension by simply agreeing with one side; strong TOK responses maintain genuine intellectual tension and acknowledge that knowledge is complex, contested, and context-dependent.

A worked example using the prescribed title "Does the reliability of knowledge depend on the methods used to produce it?" might run: Claim: In the natural sciences, peer review and replication produce knowledge that is highly reliable precisely because the methods are transparent and reproducible (example: the discovery of the Higgs boson, confirmed independently at CERN). Counterclaim: In history, even rigorous archival methods produce contested accounts because the available evidence is incomplete and perspectival (example: revisionist histories of colonialism that emerged when previously marginalised archives were accessed).

Real-Life Situations (RLS) are the grounding mechanism for both claims and counterclaims. IB examiners look for specific, concrete examples rather than vague generalisations. The student who writes "scientists sometimes make mistakes" earns less credit than the student who cites the replication crisis in social psychology and explains what it reveals about the limits of peer review. Teaching students to collect and analyse specific cases throughout the course, rather than scrambling for examples during essay writing, is one of the most effective TOK teaching strategies available.

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TOK Exhibition: The Internal Assessment

The TOK Exhibition replaced the old TOK Presentation when the 2022 syllabus launched. It is internally assessed (marked by the TOK teacher, moderated by the IB) and counts for one-third of the total TOK grade. Students work individually on their Exhibition, even if classroom preparation is collaborative (IB Organisation, 2022).

Each student selects one of 35 prescribed IA prompts. Examples include: "What are the implications of having, or not having, knowledge?", "Does some knowledge belong only to particular communities of knowers?", and "Why do we seek knowledge?". The full list is published by the IB and does not change frequently, which means students benefit from seeing annotated examples of strong and weak responses.

The student then identifies three real-world objects that they argue illuminate the chosen prompt. These must be genuine objects from the world, not abstract concepts: a photograph, a scientific instrument, a piece of legislation, a work of art, a personal artefact. For each object, the student writes a commentary of approximately 100 words linking the object to the IA prompt through the lens of TOK concepts. The total commentary is approximately 950 words.

Common Exhibition pitfalls include: choosing objects that are too similar (limiting the range of TOK concepts used), providing descriptive accounts rather than genuine TOK analysis, and failing to connect each object explicitly to the IA prompt. Teachers marking Exhibitions should use the IB descriptors carefully: the highest marks require explicit use of TOK vocabulary, clear conceptual analysis, and genuine insight rather than surface-level connection.

A practical teaching approach: run a whole-class "object gallery" early in the course. Each student brings an object and presents a two-minute explanation of what TOK concept it could represent. This builds the habit of seeing TOK in everyday situations, which is exactly the skill the Exhibition assesses.

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TOK Essay: The External Assessment

The TOK Essay is externally assessed by IB examiners and counts for two-thirds of the total TOK grade. Students choose one of six prescribed titles issued by the IB for each examination session and write an essay of exactly 1,600 words. The word count is strictly enforced: examiners stop reading at 1,600 words, and essays that substantially exceed this limit are penalised (IB Organisation, 2022).

Prescribed titles are written to be deliberately open: they resist simple answers and reward nuanced argument. Titles typically contain a claim or a question that can be approached through multiple AOKs and perspectives. A strong essay engages with at least two different AOKs, uses specific Real-Life Situations as evidence, constructs genuine claims and counterclaims, and arrives at a conclusion that acknowledges complexity rather than asserting a simple verdict.

The structural blueprint that works for most prescribed titles is: Introduction (unpack the title, define key terms, signal your line of argument, approximately 150 words), Body (two or three extended paragraphs each with a claim, RLS, and counterclaim; each paragraph explores a different AOK or perspective), Conclusion (evaluate the line of argument, acknowledge limitations, do not introduce new claims, approximately 150 words).

Common mistakes in TOK essays include: treating the essay as a subject-specific essay rather than a knowledge essay, providing examples without explicit analysis of what they reveal about knowledge, writing a balanced "on the one hand/on the other hand" structure that never reaches a genuine position, and failing to define key terms in the title. Teachers should model close reading of prescribed titles, showing students how to identify the key knowledge claims, the implied AOKs, and the direction the title invites the argument to take.

Essay drafting is most effective when done in stages: a Knowledge Question extraction session, a claim and counterclaim generation session, an RLS collection session, then a full draft. Students who attempt to write the essay in one sitting without this preparatory work almost always produce descriptive rather than analytical responses.

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The EE/TOK Bonus Points Matrix

One of the least understood features of the IB Diploma is the bonus point matrix that rewards strong performance in both TOK and the Extended Essay. Up to 3 additional points can be added to the student's total out of 45, potentially making the difference between achieving the Diploma and falling short of it.

A grade E in either TOK or the Extended Essay results in automatic failure of the Diploma regardless of the student's total subject points score. This makes TOK a high-stakes component that cannot be neglected. Students who achieve A grades in both TOK and the Extended Essay receive the maximum 3 bonus points. In practice, the most significant guidance for students is: a grade C or above in both components is required to receive any bonus points at all, and grades below that have real consequences.

When advising students on prioritising their workload, teachers should frame the bonus point matrix explicitly. A student on 38 subject points who achieves A/A in TOK and the Extended Essay will reach the 41-point threshold for many competitive university offers. The matrix makes the case for sustained effort in TOK that no amount of abstract motivation can.

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The DP Core: Where TOK Fits

Understanding where TOK sits within the broader IB Diploma Programme helps teachers explain its purpose to students and parents. The DP Core comprises three mandatory components: Theory of Knowledge, the Extended Essay, and Creativity, Activity, Service. These components distinguish the IB Diploma from A-Level and other national qualifications: they require students to demonstrate breadth, self-management, and intellectual reflection rather than subject-specific content alone.

The CAS programme connects to TOK through the concept of experiential knowledge. Students engaged in a CAS project, whether coaching a sports team, running a community garden, or learning an instrument, are accumulating a form of knowledge that formal schooling rarely addresses: knowledge through doing, through failure, through feedback from the real world. TOK invites students to examine this experiential knowledge using the same epistemological tools they apply in the classroom.

The Extended Essay is the most direct complement to TOK. Both assessments ask students to think independently and to engage with genuine academic inquiry. The EE requires a student to sustain an argument over 4,000 words in a specific subject area; TOK asks them to reflect on the methods and assumptions underlying that argument. Students who develop their TOK thinking alongside their EE writing typically produce more epistemologically aware research papers, because they are better equipped to identify what kind of knowledge their methodology can and cannot produce.

The IB Learner Profile attributes, particularly "Inquirers", "Thinkers", "Open-minded", and "Reflective", are directly cultivated through TOK. Students who engage authentically with the course develop the intellectual habits described in the Learner Profile not as abstractions but as practised dispositions.

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Epistemology and Justified True Belief

The philosophical foundation of TOK is epistemology: the branch of philosophy concerned with the nature, scope, and limits of knowledge. The classic definition, attributed to Plato, holds that knowledge is "justified true belief": a claim counts as knowledge if it is true, if you believe it, and if you have good reasons to believe it. This definition, simple as it sounds, has been challenged by thought experiments such as Gettier cases, which show that justified true belief is neither sufficient nor always necessary for what we intuitively call knowledge (Dombrowski, Rotenberg and Bick, 2013).

TOK students do not need to master the full technical literature of epistemology. They do need to understand that "knowing" is not the same as "believing", that evidence comes in different forms with different degrees of reliability, and that the justification for a belief matters as much as the belief itself. These distinctions allow students to evaluate knowledge claims critically rather than accepting or rejecting them on instinct.

In practical terms, epistemological grounding helps students avoid two common errors. The first is naïve realism: the assumption that our perceptions and intuitions directly and accurately represent the world. The second is naïve relativism: the assumption that because knowledge is perspectival, all claims are equally valid. Both errors undermine rigorous TOK inquiry. Strong TOK students learn to hold a position between these: knowledge is fallible and perspectival, and some claims are nevertheless better justified than others.

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Embedding TOK Across the Curriculum

One of the recurring challenges for TOK teachers is the perception, held by students and sometimes by subject teachers, that TOK is a separate entity with no connection to regular subjects. Effective IB schools reject this separation. Subject teachers play a crucial role in identifying "TOK moments" within their disciplines and making the epistemological subtext of their lessons explicit.

The Thinking Framework provides a practical scaffold for this. Its eight cognitive operations (Compare, Classify, Sequence, Cause and Effect, Part-Whole, Analogy, Perspective, and Systems Thinking) map directly onto the kinds of thinking TOK requires. When a science teacher asks students to compare two competing models of a phenomenon, they are doing TOK. When a history teacher asks students to examine the same event from multiple national perspectives, they are doing TOK. Making this explicit takes thirty seconds and builds cumulative epistemological awareness across two years of study.

In mathematics, TOK moments arise when teachers ask whether a proof is the only way to establish certainty, or whether the axioms of Euclidean geometry are the only possible starting points for a mathematical system. In literature, they arise when teachers ask what a fictional narrative can reveal that a historical account cannot. In economics, they arise when teachers discuss the assumptions underlying econometric models. None of these require specialist TOK training; they require only the habit of surfacing the epistemological layer that already exists in every disciplinary question.

The Approaches to Learning skills, particularly thinking skills, research skills, and communication skills, provide a complementary framework. When students practise thinking skills across all their subjects, they are building the cognitive toolkit that TOK asks them to apply metacognitively. Schools that treat ATL skills and TOK as parallel rather than separate projects typically see stronger TOK performance.

Practical approaches for subject teachers include: end-of-lesson "TOK questions" that ask students to identify what kind of knowledge they have been using, cross-curricular "Knowledge Journals" where students record TOK-relevant observations from all their subjects, and collaborative units where the TOK teacher and a subject teacher design a sequence that moves between subject content and epistemological reflection. The IB's own resources include subject-specific TOK links in every subject guide; these are an underused asset for subject teachers who want to embed TOK without becoming epistemology experts.

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TOK Teaching Strategies That Work

TOK is a course that fails when taught didactically. Students who passively receive information about epistemology learn neither TOK nor epistemology. The most effective TOK lessons are structured around genuine disagreement, real-world situations, and collaborative inquiry. The following strategies consistently produce strong TOK engagement and assessment performance.

The "Shared vs Personal Knowledge" distinction is one of the most generative early activities. Ask students to list five things they know, then classify each as personal knowledge (based on individual experience) or shared knowledge (based on publicly available evidence). The exercise invariably produces edge cases: is my memory of a historical event personal or shared? Is cultural tradition personal or shared? These edge cases are the starting point for genuine TOK discussion.

Real-world news analysis builds the habit of seeing TOK in everyday situations. A fifteen-minute weekly activity in which students examine a current news story through the Knowledge Framework (scope, perspectives, methods, ethics) develops the analytical habits needed for both the Essay and the Exhibition. The story of a scientific retraction, a disputed historical claim, a politically contested statistic, or an AI-generated artwork can each provide a semester's worth of TOK discussion if analysed carefully.

Structured controversy is one of the most effective cooperative learning formats for TOK. Students are assigned positions on a knowledge question and must construct the strongest possible argument for that position, then switch and argue the opposite. This breaks the tendency to argue from personal belief rather than from epistemological analysis, and it models the claim-counterclaim structure of the TOK Essay. The questioning strategies used in structured controversy, particularly Socratic questioning, transfer directly to TOK discussion and essay writing.

AOK deep dives work best when they are led by subject experts. Inviting a mathematician into the TOK classroom to discuss whether mathematics is discovered or invented, or asking a history teacher to model how they evaluate the reliability of a primary source, makes the epistemological content of each AOK authentic rather than secondhand. Students who see their subject teachers engaging seriously with TOK questions are more likely to see those questions as genuinely important.

Assessment preparation should begin early and be integrated into normal teaching. Students who wait until Year 12 to start thinking about their Exhibition prompts invariably struggle; those who maintain an ongoing "real-world situations journal" throughout the course have a bank of specific, analysed examples to draw on. The same applies to essay writing: regular paragraph-level practice in constructing claims and counterclaims, with feedback from the teacher, is more effective than a single extended essay-writing unit close to the submission deadline.

The cognitive levels of Bloom's Taxonomy map usefully onto TOK assessment demands. Knowledge and comprehension questions about TOK concepts prepare students for the lower levels of response; analysis, evaluation, and creation questions, including the ability to construct and evaluate knowledge claims, are what the Essay rewards. Planning lessons that deliberately move from lower to higher cognitive levels helps students develop the analytical capacity the course demands. The AI prompt templates for higher-order thinking can help teachers design discussion questions and essay practice prompts at the right level of cognitive demand.

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Navigating Artificial Intelligence in TOK

The emergence of generative AI has made the Technology Optional Theme more urgent than ever, and it has also raised genuine challenges for TOK assessment integrity. The IB's official position is that AI tools, including large language models, may be used as research aids but that student work submitted for assessment must represent the student's own thinking. AI-generated text submitted as a student's own work constitutes academic misconduct regardless of the quality of the output (IB Organisation, 2023).

For TOK teaching, AI provides an extraordinary set of discussion prompts. What kind of knowledge does a language model produce? Is its output a form of knowledge or a simulation of knowledge? If a model generates a plausible-sounding argument for a position it has not "reasoned" about, what does this reveal about the relationship between linguistic fluency and genuine understanding? These questions connect directly to the Technology Optional Theme and to the Core Theme's exploration of how personal cognitive processes shape knowledge.

A practical classroom activity: ask a language model to write a TOK-style paragraph on a prescribed title, then ask students to identify what is epistemologically missing from the output. Students almost always find that the AI's response lacks genuine claims and counterclaims, real specificity in its RLS, and any acknowledgement of the limitations of the argument. This exercise builds both AI literacy and TOK assessment skills simultaneously.

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What to Try in Your Next TOK Lesson

Before the next lesson, identify one real-world situation from the news or from your subject area that involves a contested knowledge claim. It could be a scientific study that has been misrepresented in media coverage, a historical event narrated differently in two national contexts, or a mathematical model used to support a political decision. Bring this situation to class and ask students to apply the Knowledge Framework: what does this situation's AOK claim about it? Whose perspectives are present or absent? What methods produced this knowledge? What ethical responsibilities does it raise? Then ask: what Knowledge Question does this situation generate? The quality of the Knowledge Questions students produce will tell you exactly where the next lesson needs to go.