What Is the IB-PYP (International Baccalaureate Primary Years Programme)? An Elementary Curriculum Centered on Inquiry, and What Research Has Shown
Why this topic is on your mind
“The IB (International Baccalaureate)”: you may have heard of it as a university entrance program in which high school students write papers in English. In fact, the IB has a program for preschool and elementary school children aged 3 to 12 (the PYP = Primary Years Programme), and in recent years the number of authorized schools in Japan has been quietly growing.
As the time for choosing an elementary school approaches, questions like these come up.
- How are “IB-authorized schools” different from ordinary elementary schools?
- I hear about “inquiry-based learning”, but will it really lead to academic ability for my child?
- Is there enough evidence to justify annual fees of ¥1,000,000 to ¥3,000,000?
- If we can’t send our child there, is there anything we can do at home?
Precisely because it is a method that has spread internationally, when you look into it, so much information comes up that you can’t tell what to rely on. Here, we set out the content of the IB-PYP and what research has shown.
The origins and ideas of the IB-PYP
The IB-PYP is the stage for the youngest ages among the four programs run by the International Baccalaureate Organization (IBO), based in Geneva, Switzerland.
- 1968
The International Baccalaureate Organization (IBO) is founded and creates the IB Diploma Programme (DP)
The starting point was to provide a university entrance qualification common across the world for high school students from families who move across borders, such as children of diplomats and staff of international organizations.
- 1994
The Middle Years Programme (MYP) is introduced
Developed as a curriculum for the junior high school stage for ages 11 to 16, connecting to the DP.
- 1996-1997
The Primary Years Programme (PYP) is born
Piloted at 30 schools around the world in 1996, with the first officially authorized schools in 1997. It was systematized as an educational program for ages 3 to 12 centered on 'inquiry'. Its origin was the International Schools Curriculum Project (ISCP), which had been running for more than 10 years.
- 2012
The Career-related Programme (CP) is added
The four-program structure (PYP / MYP / DP / CP) is completed, forming a continuum of IB education from age 3 to 19.
- Today
Offered at more than 5,800 schools in more than 160 countries and territories
In Japan, IB-authorized and candidate schools total 265 (of which, for the PYP, 90 authorized and 32 candidate schools; MEXT IB Education Promotion Consortium, as of March 2026). Introduction at public schools is also progressing.
What we want to note here is that the IB originally arose from a kind of practical need: “to provide children of families who move across borders with an education that is valid anywhere in the world”. It was not a program created for the purpose of “giving bright children an early elite education”; its starting point was to secure continuity of learning for children who move between environments with different cultures and languages.
The ideas the IB-PYP values
The IB-PYP is a curriculum that places “transdisciplinary inquiry” at its center. Its core ideas are as follows.
- Children are naturally inquiring beings: rather than teachers “drilling in” knowledge, learning moves forward starting from children’s own questions
- Learning across subject boundaries: rather than separating “math time” and “science time”, one theme is dealt with from several areas and many angles
- Developing an international mindset: an attitude of seeing one’s own culture in relative terms and respecting other cultures is shaped in everyday life from the lower grades
- Connecting to action: rather than having what is learned end within the classroom, importance is placed on it showing up as small actions toward oneself and the world around
The six “transdisciplinary themes”
PYP inquiry proceeds through the year along six transdisciplinary themes. These are the backbone of the PYP.
The six transdisciplinary themes of the PYP
Units of inquiry are built along these themes throughout the year
The six themes surrounding “inquiry” at the center become the pillars of each year’s units. A feature of the PYP is going beyond the boundaries of subjects such as science, social studies, Japanese language, and math, and digging into one theme from many angles.
Source: Diagram by the editorial team based on the International Baccalaureate Organization’s official PYP framework
For example, when dealing with the theme of “water”, children investigate the properties of water as science, investigate the distribution of the world’s water resources as social studies, read stories about water as language, and graph a day’s water use as math: this kind of cross-cutting learning is the typical form of the PYP.
What it involves in practice: what goes on in IB-PYP classrooms
If you look into an actual PYP school, you see a scene quite different from Japan’s traditional “whole-class lessons facing the blackboard”.
1. Units of inquiry
Each year, “units of inquiry” corresponding to each of the six themes are built. One unit lasts roughly 6 to 8 weeks. Starting from a central question posed at the beginning (the central idea), children also ask their own questions, investigate, summarize, and present.
2. Children ask their own questions
“Why is the sky blue?” “Why does everyone speak different languages?” Teachers do not let children’s questions like these pass, but link them to the theme of inquiry. A feature of PYP classrooms is that moments when a child who asked a question feels “sorry for asking a strange question” are very rare.
3. The PYP Exhibition (a graduation project)
In the final year of the PYP (equivalent to 6th grade of elementary school in Japan), there is the “PYP Exhibition”, a graduation project in which children choose their own theme and work on it. In groups or individually, they choose a social issue, investigate it, connect it to action, and present. It is a quite advanced learning experience for elementary school children.
4. Teachers as “facilitators”
Teachers do not take the role of standing at the front and explaining to the whole class at once; they take the role of encouraging children’s inquiry, connecting them with the resources they need, and organizing discussion. It is not that there are zero whole-class lessons, but they take up a smaller share than in traditional schools.
5. The “IB Learner Profile”
The IB sets out ten learner attributes (the IB Learner Profile) common to all four programs: “inquirers”, “knowledgeable”, “thinkers”, “communicators”, “principled”, “open-minded”, “caring”, “risk-takers”, “balanced”, and “reflective”. How to develop these qualities, not only academic results, is the evaluation axis of the PYP as a whole.
What does the research say? Two views
We need to look separately at the IB-PYP itself (its effect as a program on its own) and the effect of “inquiry-based learning”, the way of learning at the core of the PYP. For both, research includes both studies showing “it is effective” and studies showing “it is conditional and cannot be said unconditionally”.
Study A: Inquiry-based learning has learning effects, given appropriate guidance
A meta-analysis integrating 72 studies of inquiry-based learning (Review of Educational Research)
examines the effects of inquiry-based learning from three perspectives: learning process, performance, and learning outcomes. The results show moderate positive effects for all three (learning activities d=0.66, performance d=0.71, learning outcomes d=0.50). What matters is that whether effects arise depends greatly on “whether there is guidance (support)”. The conclusion of this study is that “laissez-faire inquiry”, which leaves children completely on their own, cannot be expected to be effective, and large effects appear when teachers provide appropriate scaffolding.
A meta-analysis of 37 experimental / quasi-experimental studies of inquiry-based science teaching published from 1996 to 2006
also showed that children who received inquiry-based science teaching scored about half a standard deviation (d=0.50) higher in learning outcomes than children who received traditional instruction. Here too, it is reported that effects become larger when combined with teacher-led scaffolding.
In addition, in an evaluation study of 13 public PYP schools in the state of Victoria, sponsored by the IBO itself, children at PYP schools were, in grades 3 and 5, at higher levels in reading and math than other schools in similar circumstances and the national average (though comparisons of growth rates include results in which the PYP did not necessarily come out ahead).
In Ecuador in South America, there is also research using a natural experiment in which the IB was introduced at 200 public schools. A study quasi-experimentally evaluating the effects of the IB program introduced at public schools in Ecuador (Journal of Research in International Education) found positive effects on the academic achievement of students who took the IB Diploma Programme (high school stage) and on rates of progression in secondary education. It is not research directly corresponding to the PYP, but it is one example showing that the IB approach does not “only work for wealthy families”.
Study B: However, “inquiry-based learning is a cure-all” is not the case
On the other hand, in education research there is a long-running debate over “whether inquiry-based learning is really superior to direct instruction”.
One of the most widely referred-to meta-analyses of learning effects in the world is John Hattie’s ‘Visible Learning’. An effect-size ranking of educational interventions integrating more than 800 meta-analyses (about 300 million participants) reports that the effect size of inquiry-based teaching is d=0.31. This means “there is an effect (positive)”, but at a level slightly below the 0.40 benchmark that Hattie uses as a guide. In the same summary by Hattie, feedback and clear teacher instruction tend to come out high at 0.50 to 0.70, so it is also a result that makes it hard to say “doing inquiry automatically raises grades”.
What Study B shows is a picture like this.
- Inquiry-based learning has a positive effect but is not a “magic wand”
- Leaving children with “go and investigate freely” when they lack prior knowledge has a small effect (or can even be negative)
- Combining direct instruction (explicit teaching by the teacher) with inquiry-based activities is close to the current consensus in research
In addition, there are almost no rigorous randomized controlled trials (RCTs) testing the effect of the IB-PYP program on its own. What can be observed is correlation, “children attending PYP schools tend to be like this”, and most studies cannot strictly say that attending the PYP caused it (families attending IB schools often have backgrounds such as being highly interested in education and economically well-off to begin with).
How to read the two studies
A and B appear to conflict, but it can be said that they actually look at different aspects.
- A: “guided inquiry-based learning” has moderate positive effects confirmed in several meta-analyses
- B: however, “laissez-faire inquiry” is unlikely to have effects, and combination with direct instruction is the key. Testing of the effects of the PYP program on its own should still be viewed with caution because of research methods
Taking both into account, it can be summarized like this: “the PYP style of ‘learning starting from the child’s own questions while the teacher guides’ has the features of a way of learning supported by research”, but current research cannot go as far as to say “sending your child to an IB-authorized school will automatically raise academic ability”.
There’s an IB-authorized elementary school (an international school type) near us, but it costs about ¥2,000,000 a year. It says “Raising children who can succeed in the world through inquiry-based learning”… Does it really make that much of a difference?
That’s a natural concern. What research supports is that “the way of learning called guided inquiry-based learning” itself can be expected to have learning effects, and that there are studies in which the academic achievement of children who attended IB programs comes out higher than at other schools in similar circumstances. But there isn’t yet enough rigorous research to say “sending your child to an IB school will automatically make them a child who succeeds in the world”.
So can I take that ad as an exaggeration?
It’s not all exaggeration. “An inquiry-centered way of learning”, “learning across subjects”, “everyday contact with other languages and cultures”: these do include elements for which research suggests positive effects. But those effects depend strongly on the quality of guidance and on the fit with your child’s interests and personality.
What should I look at when I go to visit?
One guide is whether moments when children ask questions are part of daily life. In the classroom, try observing the ratio between the time the teacher talks one-sidedly and the time children raise their hands to ask questions or discuss things in groups. Then it’s reassuring if you can also check whether the PYP’s “units of inquiry” are actually working (whether children’s questions and ideas remain on the displays) and whether teachers have received IB training.
Children this method suits, and children it may not
From the body of research and practice, the following tendencies are said to exist. However, they are not absolute; please read them only as a rough guide.
Children it often suits
- Children whose “Why?” and “How come?” never stop: because it is a curriculum in which children’s own questions are the starting point of learning, strong curiosity is put to direct use
- Children who are interested in several areas at once: cross-cutting interests, such as “dinosaur stories, fossil strata, extinction, and environmental problems are all connected”, fit the structure of the PYP well
- Children who can enjoy multicultural, multilingual environments: at IB schools of the international-school type, there are many situations of everyday contact with English and other cultures
Children who may need some consideration
- Children who feel more secure with tasks that have clear steps and right answers: the PYP often deals with “questions without answers”, and some children feel anxious at first
- Children who find it hard to read long written instructions or make their own plans: because inquiry depends on the child’s autonomy, the load can be high at first
- Children seriously aiming for Japanese junior high school entrance exams: the PYP curriculum has a different direction from the pattern drills tested in Japanese junior high school entrance exams. If you aim to do both, supplementing at home may be necessary
However, these do not mean “it doesn’t suit them”; they mean “it may take some getting used to and some adjustments at first”. Actual PYP schools have ways of helping children get used to the rhythm of inquiry.
Closing dialogue: what you can do at home if your child does not attend an IB school
In the end, in our case, an IB-authorized school isn’t realistic financially. I think she’ll go to an ordinary public elementary school, but are there things from the PYP’s way of thinking we can bring into the home?
There are plenty. The essence of the PYP lies in three attitudes: “valuing children’s questions”, “finding connections across subjects”, and “connecting what is learned to action”. These are parts you can develop well enough at home without attending an IB school.
In what kinds of situations, for example?
When your child asks “Why is the sky blue?”, instead of giving the answer right away, reply “Good question, what do you think?” or “Shall we look it up together?”. Just this makes the exchange very close to what happens in a PYP classroom.
I’m often busy and end up brushing it off with “later”…
Many mothers and fathers do that, so it’s not something to blame yourself for. But if you can take in even one of your child’s questions a day without brushing it off, that gradually develops the sense that “my questions have meaning”. In essence, this is the same thing the PYP develops over time across the whole classroom.
How do we find connections across subjects?
For example, while shopping at the supermarket, talk about “Where did this banana come from?”, “Why don’t bananas grow in Japan?”, and “How long does it take to transport them?”. Geography, climate, distribution, energy: all sorts of areas connect to a single piece of fruit. You can make as many miniatures of what the PYP calls “transdisciplinary inquiry” as you like in everyday family conversation.
Somehow I feel a bit more at ease knowing there are things we can do even without sending her to an IB school.
That’s right. What research says is that “there are situations where children exploring with their own questions has higher learning effects than teachers only teaching one-sidedly”. The part that fathers and mothers can put into practice at home is larger than you might imagine.
Research details
Primary sourcesStudy design: Meta-analysis of 72 empirical studies on inquiry-based learning
Participants: A wide range of ages from young children to university students, 72 studies in total
Main results: Effect sizes of inquiry-based learning were learning activities d=0.66 (95%CI [0.44, 0.88]), performance success d=0.71 (95%CI [0.52, 0.90]), and learning outcomes d=0.50 (95%CI [0.37, 0.62]), all moderate positive effects. It was clearly shown that whether there is guidance (teacher scaffolding) determines the size of the effect.
Limitations: The included studies cover a wide range of ages, subjects, and settings, so they do not correspond directly to the effects of a specific curriculum like the PYP.
Study design: Meta-analysis of 37 experimental / quasi-experimental studies of inquiry-based science teaching published from 1996 to 2006
Participants: Mainly elementary to junior high school students (K-12), centered on science education research
Main results: Children who received inquiry-based science teaching scored about half a standard deviation (d=0.50) higher in learning outcomes than children who received traditional instruction. A tendency for effects to be larger the more teacher scaffolding was combined.
Limitations: A group of studies limited to science education; effects on other subjects and on whole-person development need separate verification.
Study design: A mega-analysis integrating more than 800 meta-analyses on the effects of educational interventions
Participants: Includes about 300 million learners worldwide
Main results: The effect size of inquiry-based teaching is d=0.31. There is a positive effect, but slightly below Hattie’s guide of 0.40. Compared with feedback (d≈0.70) and clear teacher instruction, the effect is modest.
Limitations: The “0.40 benchmark” for effect size is itself controversial, and some criticize reading 0.31 as “little effect” as going too far. Also, d=0.31 differs somewhat from the figures of other meta-analyses (Lazonder & Harmsen, Furtak et al.), and results vary depending on how studies are selected.
Study design: Evaluation of the effects of the IB Diploma Programme introduced at public schools in Ecuador using quasi-experimental methods (difference-in-differences analysis, etc.)
Participants: About 200 public schools in Ecuador where the IB was introduced from 2006 onward
Main results: Students who took the IB program showed positive effects on academic results and rates of progression in secondary education. Shows that the IB does not “only work at private schools for wealthy families”.
Limitations: Research targeting the DP (high school stage), not the PYP. Parts depend on Ecuador’s specific institutional context, so care is needed in generalizing to other countries and stages.
Study design: Evaluation study of 13 public PYP-authorized schools in the state of Victoria (commissioned by the IBO)
Participants: 13 public PYP schools, cohorts 2008-2010, 2009-2011, and 2010-2012
Main results: Grade 3 and grade 5 students at PYP schools showed higher levels in reading and math than other schools in similar circumstances and the national average. On the other hand, in comparisons of growth rates, other schools sometimes came out ahead.
Limitations: Because the research was sponsored by the IBO, attention is needed to its independence. The sample is limited to 13 schools and depends on the context of Victoria.
Content: Official information such as the official history of the PYP (1996 pilot, first official authorization in 1997), target ages (3 to 12), the six transdisciplinary themes, the IB Learner Profile, and the number of authorized schools. The descriptions of history and curriculum structure in this article rely on this official source.
Limitations: Because this is information from the program provider itself, descriptions of effects and benefits need to be read after checking against independent research.
Content: Official statistics such as the number of IB-authorized and candidate schools in Japan (265 in total as of March 2026; for the PYP, 90 authorized and 32 candidate schools) and the state of introduction at public schools. The descriptions of the situation in Japan in this article rely on this official information.
Limitations: Authorization status changes over time, so refer to the consortium’s official website for the latest information.