In simple terms
A friendly intro before the formal notes — no formulas yet.
The CAS Project: From Idea to Impact
The CAS Project is a long-term, collaborative series of experiences that you and at least one other student initiate and manage. It's your chance to take ownership of a significant undertaking that benefits a community and pushes you to grow. Effective planning and deep reflection are what transform a good idea into a successful project that showcases your development.
Think of a CAS project like designing and building a community garden. You can't do it alone in an afternoon. First, you 'investigate' what the community needs and what can grow there. Then you 'prepare' by gathering a team, sourcing tools, and creating a layout. The 'action' is the planting and tending. Throughout, you 'reflect' on challenges like pests or bad weather and how you overcame them. Finally, you 'demonstrate' your success not just with the harvested vegetables, but by sharing the story of your teamwork, problem-solving, and the new skills you cultivated.
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Identify a genuine need in a community you care about and find at least one collaborator.
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Develop a detailed plan using the five CAS stages, outlining goals, roles, a timeline, and how you will address specific learning outcomes.
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Execute your project, consistently gathering evidence (e.g., meeting notes, photos, emails) of your process and progress.
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Write regular, meaningful reflections that analyse challenges, successes, and personal growth, explicitly linking them to the CAS learning outcomes.
Explore the concept
Use the live diagram and synced steps — play it or tap a step card to walk through.
Full topic notes
Formal explanation with the rigour you need for the exam.
Deconstructing the CAS Project Requirements
To be formally recognised as a CAS Project, your undertaking must meet three specific criteria set by the IB. Understanding these is the first step to success.
Collaborative: You must work with at least one other person. This is non-negotiable. Your reflections must explore the dynamics of this teamwork.
Sustained: The project must last for a minimum of one month from the start of planning to the conclusion. This demonstrates commitment and perseverance (LO4).
Student-Initiated: The project must be conceived and planned by you and your team. While you will have a supervisor, the driving force must come from the students themselves, clearly demonstrating LO3.
Stage 1: Investigation and Preparation - The Blueprint for Success
A successful project is built on a foundation of thorough planning. The first two CAS stages, Investigation and Preparation, are where you lay this groundwork. During Investigation, you identify your interests, skills, and a genuine need within a community. In Preparation, you form a team, define roles, set goals, create a timeline, and anticipate potential challenges. This is where you explicitly map your project aims to the CAS learning outcomes you intend to achieve.
Evidence vs. Reflection: Showing vs. Telling
As you move through the 'Action' stage, you must document your journey. Evidence is the 'proof' that your project happened. This can include photos, videos, meeting minutes, planning documents, or emails. However, evidence alone is not enough. Your CAS portfolio is assessed on your reflections. Reflection is the narrative that explains the meaning of the evidence. It's where you analyse your experiences, articulate your feelings, and connect your actions to personal growth and the learning outcomes.
Curate your evidence purposefully. Instead of uploading 20 similar photos, choose one powerful image and write a detailed reflection about what was happening in that moment. For example, a photo of your team in a heated discussion could be a springboard for a reflection on resolving conflict and the benefits of collaboration (LO5).
Mastering Reflection for the Learning Outcomes
High-quality reflections are analytical, not just descriptive. They form the core of your CAS portfolio and are the primary way you demonstrate that you have met the learning outcomes. Avoid simply listing the outcomes. Instead, weave them into a compelling story of your development. For each key moment in your project—a challenge, a success, a decision—ask yourself: What did I learn? How did I change? Why was this significant?
Worked examples
See the formulas applied — reveal one step at a time, like the exam.
Draft an initial plan for a proposed CAS project: 'Organising a weekly coding club for younger students at our school to improve their digital literacy skills.'
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CAS Project Proposal: Junior Coding Club
During the 'Junior Coding Club' project, your team disagreed on whether to use Scratch (easier) or Python (more advanced) for the main lessons. Reflect on this challenge, connecting it to LO5 (collaboration) and LO2 (developing new skills).
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Initially, our team was deadlocked. I advocated for Python, believing it offered more long-term value, while my partners argued for Scratch to ensure the younger students wouldn't be intimidated. This was our first major challenge in collaboration (LO5). Simply stating my opinion wasn't working; we were talking past each other. To resolve this, I had to develop a new skill in active listening and compromise (LO2). I stopped pushing my idea and instead proposed a structured debate where we listed the pros and cons of each from the perspective of a 12-year-old. This process led us to a hybrid solution: starting with Scratch to build confidence and then introducing Python concepts using a visual, game-based approach. The conflict, which initially felt like a setback, actually strengthened our team. It taught me that effective collaboration isn't about winning an argument, but about synthesising different perspectives to arrive at a better outcome than any one person could have conceived alone. The new skill wasn't coding; it was facilitating a constructive disagreement.
How it all connects
The big idea sits in the middle — tap a linked idea to explore the link.
Tap a linked idea to see how it connects back to the main topic — that connection is what examiners reward.
Glossary
Try to recall each definition before you reveal it.
Quick check
Answer in your head first — then tap to check. No pressure.
Revision flashcards
Flip the card. Test yourself before the exam.
What defines a CAS Project?
A collaborative, sustained series of CAS experiences lasting at least one month, initiated by students and structured around the five CAS stages.
Key takeaways
Review these before you close the topic — retrieval beats re-reading.
- ✓
Collaborative: You must work with at least one other person. This is non-negotiable. Your reflections must explore the dynamics of this teamwork.
- ✓
Sustained: The project must last for a minimum of one month from the start of planning to the conclusion. This demonstrates commitment and perseverance (LO4).
- ✓
Student-Initiated: The project must be conceived and planned by you and your team. While you will have a supervisor, the driving force must come from the students themselves, clearly demonstrating LO3.
Practice — then mark it
The whole point: a real Cambridge question, marked mark-by-mark.
Test Your CAS Project Knowledge
Test Your CAS Project Knowledge
Extra simulations & links
PhET, GeoGebra and other curated tools — open in a new tab.
Frequently asked
Checkpoint
One marked question is worth ten re-reads — close the loop before you move on.
Reading it isn’t knowing it — prove it.
Before you move on: do Test Your CAS Project Knowledge on paper, snap a photo, and get examiner-style feedback on exactly where you win and lose marks.