ib-pyp-unit-inquiry-planning-guide-teachers

ib-pyp-unit-inquiry-planning-guide-teachers is a guide to planning a PYP Unit of Inquiry. This is a structured, transdisciplinary sequence built around a central idea, lines of inquiry and learner questions. In the current Enhanced PYP, learner agency means voice, choice and ownership. It sits inside a planned framework, not outside it (International Baccalaureate Organisation, 2019; Furtak et al., 2012).

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In a Year 5 water unit, the teacher may first teach evaporation explicitly and model a research protocol. Learners can then test whether their own questions about scarcity, rights and responsibility can be answered with evidence. Planning PYP unit work is therefore recursive, which means teachers return to it as learning develops. They revisit the central idea, assessment evidence and questions throughout the unit, not only at the start.

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PYP Unit of Inquiry Planning

A Unit of Inquiry is a four-to-eight-week PYP unit built around a Central Idea, lines of inquiry and planned learning experiences. In the Enhanced PYP, teachers link each unit inquiry to one of six transdisciplinary themes. They also co-construct parts of the inquiry with learners through voice, choice and ownership (International Baccalaureate Organisation, 2019). Learner questions can shape the route, but they do not replace the teacher's curriculum map, explicit teaching or assessment plan (Wiggins & McTighe, 2005; Furtak et al., 2012).

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Dewey (1938) argued learning through questions and experience builds better understanding. Bruner (1960) suggested revisiting core concepts in a spiral curriculum. PYP units use this principle, linking ideas across years. Learners explore ideas again with more complexity as they grow.

The International Baccalaureate Organisation (2019) presents the Unit of Inquiry as a way to build international mindedness. It does this through disciplined inquiry, action and reflection.

PYP learners usually work through at least six units each year across the transdisciplinary themes. The PYP Exhibition takes place in the final year of the PYP programme, depending on the school's structure. It is typically for learners aged 10 to 12, rather than being fixed to Year 6 or Year 7.

Evidence overview

What the research says

PYP teachers need to see a Unit of Inquiry as collaborative learning, not just a set of topic lessons. In inquiry-based teaching, teachers investigate alongside learners rather than only deliver pre-set lessons. This matches the PYP's Approaches to Teaching (IB Organisation, 2018). Genuine inquiry helps learners deepen their grasp of the topic (Murdoch, 2015).

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The Inquiry Cycle

Murdoch (2015) sees inquiry as repeated processes, not fixed stages. Learners tune in by using prior knowledge and asking questions. Use it as a starting point for professional discussion: identify the learner's current need, record evidence from more than one lesson, and agree the next classroom adjustment with the SENCO or family.

They then find out by researching and gathering information. Learners sort out information and go further to deepen understanding. Next, learners make conclusions and take action (Murdoch, 2015).

The inquiry cycle is recursive, not linear. In simple terms, learners may move back to an earlier point when their thinking changes.

A learner researching water scarcity may find that their first question is too broad. They then loop back to frame a better one.

A class discussion in the sorting-out phase may show a gap in understanding and send learners back to sources. This is not a failure of the planning process, but inquiry learning working as intended.

Teachers who understand that inquiry often loops back can plan flexibly without leaving learning to chance. They do not need to script each day's activity.

Instead, effective PYP teachers identify the knowledge, vocabulary and approaches to learning learners should practise in each phase of the unit. They then prepare several possible learning experiences for each phase. This requires questioning strategies that help teachers judge where learners are in the planning process and what move would be most useful next.

Claxton (2002) says flexible teaching builds 'learning power' through resourcefulness and reflectiveness. Learners also develop resilience and reciprocity when teachers respond well to their needs. Units of Inquiry can build these capacities in ways that tightly scripted lessons do not.

One practical tool for managing the inquiry cycle is a class question board, where learners post questions as they arise. The teacher's role is to categorise these questions, draw attention to the most productive ones, and help learners recognise when a question has been answered versus when it requires further investigation. This makes metacognition in the classroom visible and shared rather than an invisible internal process.

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Planning Transdisciplinary Themes

The six PYP transdisciplinary themes provide the organising framework for all Units of Inquiry. They are: Who We Are, Where We Are in Place and Time, How We Express Ourselves, How the World Works, How We Organise Ourselves, and Sharing the Planet. Each theme is broad enough to encompass genuine complexity while focussed enough to give units direction.

When planning a unit, the first decision is which theme it sits within. This is not always obvious. A unit on migration might fit within Where We Are in Place and Time (historical and geographical), How We Organise Ourselves (social and political systems), or Sharing the Planet (human impact and shared responsibility). The choice shapes the Central Idea and the Lines of Inquiry that follow, so it warrants careful discussion within the planning team.

The International Baccalaureate Organisation (2019) separates transdisciplinary learning from topic work. Topic work keeps subject boundaries and adds activities that are only loosely linked. Transdisciplinary learning uses subject knowledge when the inquiry needs it.

For UK schools, teachers still need to map the central idea and lines of inquiry against National Curriculum, Ofsted or ISI expectations. Maths, science, geography and economics can work together, but schools must be able to show coverage clearly rather than assume it.

Transdisciplinary units need teamwork. Teachers often struggle to plan across several subjects on their own. PYP schools schedule joint planning with specialists, so single-subject teachers can contribute to the transdisciplinary unit, in line with the PYP's published planning model (IB Organisation, 2018). Without this team planning, units risk becoming mere topic work.

Transdisciplinary Theme	Example Central Idea	Key Subject Connections
Who We Are	Identity is shaped by personal history, culture, and the choices we make	PSHE, History, Language
Where We Are in Place and Time	Migration shapes the identities of people and places	Geography, History, Language, Art
How We Express Ourselves	The arts communicate ideas that words alone cannot convey	Art, Music, Drama, Language
How the World Works	Natural systems maintain balance through interdependence	Science, Geography, Mathematics
How We Organise Ourselves	Economic systems reflect the values and priorities of societies	Economics, Mathematics, History
Sharing the Planet	Human choices have consequences for future generations	Science, Geography, Ethics

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Central Ideas and Lines of Inquiry

The Central Idea is key when planning. It's a statement showing transferable understanding. A strong Central Idea is relevant for learners and age appropriate. Learners can reasonably debate its meaning (Wiggins and McTighe, 2005).

Weak Central Ideas list facts, not concepts. For example, "Rainforests have many species" is not a Central Idea. A conceptual idea, such as "Biodiversity depends on connected systems," works better because learners can use it in new situations. This fits the transfer-of-learning logic in backward design (Wiggins & McTighe, 2005).

Lines of Inquiry break the Central Idea into three threads learners can investigate. They should use the current seven PYP specified concepts: form, function, causation, change, connection, perspective and responsibility.

Older PYP resources listed eight key concepts because Reflection used to be a separate lens. In the Enhanced PYP, reflection runs through inquiry, assessment and action, so many school websites and teacher resources that still say "8 lenses" are out of date in 2026. A unit on economic systems might use form, function and responsibility to examine markets, value and social priorities.

Good Lines of Inquiry need clear thinking, much like learning objectives. Use Bruner's (1960) spiral curriculum principle to check this.

Does each Line of Inquiry revisit simpler concepts before moving on? Does it then open up more complex ideas later? This approach brings coherence and builds learner confidence.

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Differentiation in PYP

Vygotsky (1978) helps explain why scaffolding inquiry learning is hard to judge. Learners need support inside the zone of proximal development, where work is just beyond what they can do alone. Yet too much help can remove the intellectual demand. Hmelo-Silver et al. (2007) and Tabak (2004) support varied help around a shared task, not separate low-level tasks.

In PYP unit planning, SEND, EAL and neurodivergent learners need clear vocabulary, visual structure, limited choices and time to rehearse talk before open investigation.

PYP differentiation focuses on the complexity of resources, the structure of research and the final form of communication. Learners who need support can use templates and simpler texts. More advanced learners can critique sources, spot gaps and explore counterarguments (Tomlinson, 2001). All learners still explore the same central idea.

Scaffolding is the key mechanism here. Effective scaffolds in inquiry learning are temporary and fading: they give learners access to the inquiry without doing the intellectual work for them. A graphic organiser that prompts learners to record what they know, what they want to find out, what evidence says and what still needs checking is a scaffold. A worksheet that tells learners what to look for and where to find it is a substitute for inquiry, not a support for it.

Cognitive load theory makes the issue of teacher control clear. Learners with less prior knowledge often find open investigation harder. Their working memory can quickly fill up with searching, reading and choosing a method.

Kirschner, Sweller and Clark (2006) and Sweller (2020) warn that minimally guided inquiry can overload novices. To reduce this load, simplify the first investigation, teach foundational vocabulary directly and fade support as learners gain control. This manages challenge, not expectations.

Collaborative learning helps teachers differentiate in PYP. Mixed-ability groups work best when each learner has a clear role and the task creates real interdependence. This means learners need one another to complete the investigation (Vygotsky, 1978).

One learner may catalogue evidence, while another builds arguments (Johnson & Johnson, 2009). Both still contribute to the same inquiry, but they work at different cognitive levels (Piaget, 1936).

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Assessment in PYP

The International Baccalaureate Organisation (2019) sees assessment as information that guides the next teaching decision, not just as evidence for reports. Teachers collect observation notes, conference records, retrieval checks and draft products, then adjust lessons. This formative feedback loop is more useful than marking alone when it changes the next learning experience (Black & Wiliam, 1998; Hattie, 2009).

PYP uses observation, performance tasks, portfolios, and conferencing for assessment. Portfolios stand out; see Primary Years Programme for details. Learners select work to show growth, including strong pieces and inquiry evidence. Learners reflect on why they chose each item.

Conferencing lets teachers check what learners understand. Teachers meet learners one to one or in small groups (Vygotsky, 1978).

This helps teachers assess concepts, not just recall. A learner who links the Central Idea to real examples shows deeper knowledge (Bruner, 1966). Simply stating research findings shows less (Piaget, 1936).

Bloom (Bloom, 1956)'s taxonomy can help teachers plan assessment tasks with a better spread of demand (Bloom, 1956). Early in the planning process, assess recall and understanding so that learners have the knowledge needed for inquiry. Later, assessment should test analysis, evaluation and creation. A PYP unit that never moves beyond collection and display misses the conceptual purpose of the unit inquiry.

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The Teacher's Role in Inquiry

Kath Murdoch (2015) says inquiry teachers research, plan, model, guide and reflect. This is not softer than direct teaching. It often requires more invisible control: selecting sources, narrowing choices, modelling methods and deciding when to intervene. The myth of pure learner agency is damaging because unguided discovery can widen gaps between confident learners and those with less prior knowledge (Furtak et al., 2012; Kirschner, Sweller & Clark, 2006).

Teachers adjust their role during units. At the start, they build safe spaces for questions, as suggested by Rosenshine (2012). Teachers activate prior knowledge and find learner misconceptions. Activating existing knowledge, even in inquiry, is vital (Hmelo-Silver et al., 2007).

During the investigation phase, the teacher's role is to ask questions that deepen thinking rather than confirm it. The move from "what did you find out?" to "why does that matter?" and then "what would have to be different for that not to be true?" shifts learners from reporting to reasoning. Carol Dweck (2006) argues that learners take on harder intellectual work when uncertainty is treated as part of learning rather than as a sign of failure.

Modelling the inquiry process is a specific and underused teacher strategy. When a teacher says, out loud, "I don't know the answer to that question. Here is how I would go about finding out," they demonstrate the intellectual behaviour the programme is trying to develop. This connects to the IB's learner profile attribute of being inquirers: learners who approach unfamiliar problems with curiosity, method and evidence rather than anxiety or avoidance.

After the unit, the teacher reviews the Central Idea, the lines of inquiry, assessment tasks and the level of learner agency, sometimes labelled learner agency in school planning documents. A short reflective log kept during the unit gives evidence for this judgement. Units improve when teams revise them using evidence of learner understanding, not only teacher preference.

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What to Try Next Week

If you are planning a new unit, start by writing three possible Central Ideas and testing each against this question: could a learner disagree with this, or is it simply true? Discard any that are merely descriptive or factual. The idea that provokes the most genuine debate is usually the strongest.

If you are currently teaching a unit, spend ten minutes before your next session listing the questions learners have generated so far. Sort them into two groups: questions that research can answer, and questions that require judgement, values or interpretation. In 2026, add a third check: if an AI tool gives an instant answer, what claim, source or assumption should learners test? This moves digital research from answer-finding to epistemic critique (Molenaar, 2022).

For your assessment practice, try one structured conference with three or four learners this week. Ask each learner to explain the Central Idea in their own words and give you an example from outside the unit that illustrates it. The quality of these responses will tell you more about conceptual understanding than any written task.

When you plan, review the previous unit's lines of inquiry. Ask whether each line led to real investigation, or whether it narrowed the answers too soon. Use classroom evidence to revise the lines of inquiry; this fits backward-design planning (Wiggins & McTighe, 2005) and Hattie's case for using assessment evidence to revise practice (Hattie, 2009). This responsive replanning keeps learner inquiry purposeful (Murdoch, 2015).

Use inquiry-based learning in your team's professional learning. Share a surprising learner reflection and talk about what it shows about the Central Idea. Then consider what you would change in your unit planning, following Vygotsky (1978). This kind of shared reflection helps your school run stronger inquiry units.

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Limitations and Critiques

PYP inquiry planning is sometimes presented as if learner choice alone guarantees depth. The evidence is less simple. Kirschner, Sweller and Clark (2006) argued that discovery with little guidance places heavy demands on working memory, especially for novices. Furtak et al. (2012) reached a more balanced conclusion: inquiry is strongest when teachers guide questioning, evidence use and explanation.

A second critique concerns culture and access. Delpit (1988) warned that progressive pedagogies can hide the rules of academic success from learners who do not already possess the language, confidence or cultural capital expected by school. This matters for SEND, EAL and working-class learners in PYP classrooms. Agency has to be taught through models, sentence frames, role rehearsal and explicit knowledge, not simply offered as choice.

The PYP evidence base also has limits in its methods. Wright and Lee (2023) found a relatively small research field. It often draws on case studies, international-school contexts and implementation reports rather than large causal trials.

Because of this, findings may not transfer neatly to UK schools facing National Curriculum, Ofsted or ISI accountability. Dweck's mindset work and Hattie's synthesis also need careful use, as effect sizes and interventions vary by context (Dweck, 2006; Hattie, 2009).

These limits do not make the PYP Unit of Inquiry weak. They make the teacher's planning process more important: explicit knowledge, guided inquiry and genuine learner action need to work together.

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References

Bruner, J. S. (1960). The process of education. Harvard University Press.

Claxton, G. (2002). Building learning power: Helping young people become better learners. TLO.

Dewey, J. (1938). Experience and education. Kappa Delta Pi.

International Baccalaureate Organisation. (2018). Learning and teaching in the IB. IBO.

Inquiry supports learners; Murdoch (2015) explores teaching with curiosity. This approach uses creativity and purpose in classrooms today. It helps learners thrive.