What a central idea is
A central idea is a sentence that expresses an enduring understanding, the big idea a unit of inquiry is designed to help students reach. It sits in the programme of inquiry beside the transdisciplinary theme and opens the lines of inquiry that follow.
It is not a topic and not a fact. Students should be able to take the understanding to a different context and find it still holds.
Five tests for a strong central idea
Apply these to any draft, including ones you have inherited.
- It is a complete sentence expressing an idea, not a topic label
- It stays true beyond the examples used to teach it
- It can carry several lines of inquiry rather than one
- It is written in language its students can grow into
- It is not a fact that can be memorised and finished with
PYP central ideas examples, by theme
These are illustrative patterns, not statements to adopt. Teachers should adapt an idea to their own context and students, and the IB's programme documentation is the authority on how central ideas are used.
Who we are: "Our choices influence our health and wellbeing." It names an understanding and invites inquiry into habits, food, sleep and community.
Where we are in place and time: "The movement of people shapes communities over time." It supports history, geography and personal stories.
How we express ourselves: "Artists make creative choices to communicate ideas and feelings." It gives room for several art forms.
How the world works: "Living things depend on the systems around them." It can carry habitats, food chains and human impact.
How we organize ourselves: "Systems help communities meet the needs of their people." It opens work on services, markets and government.
Sharing the planet: "Choices about shared resources influence sustainability." It links science, economics and ethics.
Weak ideas, rewritten
The fastest way to learn the craft is to repair drafts.
| Weak draft and why | Stronger version |
|---|---|
| "Rainforests" (a topic) | "Living things depend on the systems around them." |
| "Plants need water and light" (a fact to memorise) | "Living things adapt to survive in their environments." |
| "We learn about money" (an activity label) | "Choices about spending and saving affect how people meet their needs." |
| "Ancient Egypt" (a topic) | "Civilisations shape, and are shaped by, their environments." |
A simple design process
Start with a significant concept or phenomenon, identify the relationship or understanding students should explore, and write it as a sentence. Then test whether it invites several questions and perspectives, and revise until it does. Check it against the six themes and against the units around it.
Where skodle fits
This section names our own product, so weigh it accordingly. Writing a central idea needs a team and a whiteboard, not software.
What skodle adds is the surrounding structure. A central idea sits on its PYP unit beside the theme, lines of inquiry, key and related concepts, learner profile and assessment, the unit moves through draft, review and coordinator approval, and the programme-of-inquiry grid shows which year-and-theme cells are planned and how key concepts are spread. Its AI can suggest central ideas and lines of inquiry as a draft, from the school's most recent PYP and MYP units, for the team to accept or reject. See the PYP programme page.
The limits. skodle does not decide whether a central idea is good, and it is not a source of ready-made central ideas to adopt; the examples above are patterns, not a bank, and an AI suggestion is only a draft that reads a limited number of recent units. It counts what people link, and it does not carry the official IB registration and coursework submission route.
Writing for different ages
The same understanding can be expressed at very different levels, and a central idea should sound like it belongs to the children who will inquire into it. For younger students, use concrete, familiar words and a single relationship: "Plants and animals need each other to live." For older students, allow more abstract terms and more qualified claims: "Interdependence shapes the balance of ecosystems and the choices people make about them."
The five tests apply at every age. A central idea that fails them in simple language does not become sound by becoming more sophisticated.
Connect central ideas to the whole programme
Read the central ideas of one year group together, then the same theme across years. Look for repetition, for jumps in sophistication, and for units whose ideas could be swapped without anyone noticing. The wider process is in how to plan a PYP programme of inquiry.
Adapting examples responsibly
Copying another school's central ideas defeats the purpose: the IB expects the programme of inquiry to reflect the school's own community, so borrowed statements need to be reworked for local context and re-tested against your own lines of inquiry and students.
