It means that learning goes beyond individual subjects.
Children don't learn Maths from 9 to 10, English from 10 to 11 and then completely forget about Maths. Instead, they explore big ideas through different lenses, using each subject as a tool to better understand the world around them.
And this is where the magic happens.
I'll never forget a moment during my years as a Grade 3 homeroom teacher in an international school in Madrid.
That week's Unit of Inquiry belonged to the transdisciplinary theme Who We Are, and in English we were talking about healthy eating.
Rather than using the outdated food pyramid, we were introducing students to the Healthy Plate model: half the plate filled with vegetables, one quarter with protein and one quarter with carbohydrates.
I had already introduced the concept during our English lessons.
Later that day, I walked back into the classroom after the Spanish Maths lesson.
The Maths teacher had been explaining fractions, and the whiteboard was still full of circles divided into halves.
One of the beautiful things about transdisciplinary teaching is that you don't erase the board just because another subject is coming next. You start from what is already there.
So that's exactly what I did.
I pointed to the circle already divided into two equal parts and said:
"Remember our Healthy Plate?"
Then I drew one more line, dividing one of the halves into two equal pieces.
Suddenly, the diagram became our healthy plate.
Half vegetables.
One quarter protein.
One quarter carbohydrates.
And then... it happened.
You know that moment when you can almost hear twenty-five little brains making the same connection at exactly the same time?
Click.
Fractions were no longer just something from Spanish Maths.
Healthy eating was no longer just vocabulary from English.
The two ideas became one.
That was the exact moment I truly understood the power of transdisciplinary learning.
This doesn't mean that subjects disappear. Quite the opposite.
The PYP still includes six subject areas:
- Language
- Mathematics
- Science
- Social Studies
- Arts
- Personal, Social and Physical Education (PSPE)
The difference is that these subjects are not taught as isolated boxes. Instead, teachers work collaboratively to connect them through six Transdisciplinary Themes, giving learning purpose and making it meaningful.
Those six themes are:
🌍 Who We Are
🗺️ Where We Are in Place and Time
🎨 How We Express Ourselves
⚙️ How the World Works
🏛️ How We Organise Ourselves
🌱 Sharing the Planet
Rather than asking, "What page are we on in the textbook?", the PYP asks a much more powerful question:
"How can today's learning help children make sense of the world?"
And honestly... once you've seen twenty-five children make those connections in real time, it's very hard to go back to teaching subjects as completely separate worlds.
