IBDP Core • CAS • Written by the PrepSeven Editorial Team, reviewed by certified IB Examiners

The Complete IB CAS Guide: Ideas, Reflections and Requirements

Of the three DP core elements, CAS — Creativity, Activity, Service — is the one students most often underestimate, right up until the final months of Year 13 when a coordinator points out that documentation is incomplete and a strand is under-represented. Unlike the Extended Essay or TOK, CAS carries no grade and no formal marking criteria, which paradoxically makes it easy to neglect and genuinely difficult to do well at the same time. There’s no rubric telling you exactly what an A-grade CAS experience looks like, because CAS isn’t assessed that way — it’s assessed on whether you’ve genuinely engaged with all three strands, reflected honestly on that engagement, and completed at least one sustained CAS project, over roughly eighteen months. This guide, built by PrepSeven’s team of certified and former IB examiners and CAS coordinators, walks through exactly what’s required, how to generate ideas that won’t feel forced, and how to document your CAS experience in a way that satisfies your school’s coordinator and the IB’s moderation process without becoming a last-minute scramble.

What Is CAS, and Why Does It Exist?

CAS stands for Creativity, Activity, Service — three broad strands the IB considers essential to a well-rounded education alongside academic study. Creativity covers arts and any activity involving creative thinking, from music and visual art to entrepreneurial projects or creative writing. Activity covers physical exertion, from organised team sports to individual fitness pursuits or dance. Service covers unpaid, voluntary engagement that benefits the wider community, ideally in a way that involves genuine collaboration with the people or organisations you’re serving, rather than a one-directional act of charity.

Unlike the EE or TOK, CAS is not graded, and there is no exam or written submission marked by an external examiner. Instead, your school’s CAS coordinator reviews your engagement and documentation against the IB’s seven learning outcomes, and confirms to the IB that you’ve met the requirements needed to be awarded your Diploma. This means CAS functions less like an assessment and more like a completion requirement — but one the IB treats seriously enough that failing to complete it can prevent you from receiving your Diploma, regardless of your grades in the six subjects.

The Seven CAS Learning Outcomes

Rather than being marked against criteria, your CAS experiences collectively need to demonstrate all seven of the IB’s learning outcomes by the end of the programme. These are the real backbone of CAS, and they’re worth understanding in detail because your reflections should explicitly speak to them.

1. Identify your own strengths and areas for growth: demonstrating a degree of self-awareness about what you’re good at and what you’re working to improve.
2. Demonstrate participation in new activities that challenge you: stepping outside familiar or comfortable pursuits, not simply continuing activities you’d already mastered before starting the DP.
3. Undertake new challenges: taking on tasks that require you to build new skills, rather than repeating existing strengths.
4. Show perseverance and commitment: sustained engagement over time, rather than a handful of one-off activities completed just to tick a box.
5. Demonstrate skills in collaboration: working genuinely with others, particularly relevant to group projects and most service experiences.
6. Demonstrate engagement with issues of global significance: connecting your CAS experiences, where possible, to broader social, environmental, or global concerns.
7. Recognise and consider the ethics of choices and actions: reflecting on the ethical dimensions of your service work in particular, including questions of who benefits and how.

CAS Hours, Duration, and the CAS Project

CAS runs across the full length of your Diploma Programme, typically around 18 months, and is meant to represent sustained, ongoing engagement rather than a short burst of activity squeezed in near submission deadlines. While the IB no longer requires a fixed minimum number of hours logged (a change from earlier syllabus versions), your school will still expect regular, consistent engagement across all three strands documented throughout the full CAS period, and coordinators are generally looking for a pattern of sustained commitment rather than concentrated activity in a single term.

In addition to your ongoing CAS experiences, every student must complete at least one CAS project — a collaborative, sustained undertaking that lasts at least one month, involves genuine teamwork, and typically touches more than one CAS strand. A CAS project might be organising a fundraising event with a group of peers (Service and Creativity), building and running a school sustainability initiative (Service and Activity), or producing a collaborative arts exhibition (Creativity). The defining features are collaboration, sustained duration, and demonstrable planning.

Generating CAS Ideas That Don’t Feel Forced

The most common complaint about CAS is that it can feel artificial — activities chosen specifically because they’ll ‘look good’ for documentation rather than because a student is genuinely interested. The fix isn’t complicated, but it does require starting earlier than most students do: look first at things you’re already curious about or already doing informally, and figure out how to formalise and document them, rather than starting from scratch with an activity invented purely for CAS.

Creativity Ideas

• Learning a new instrument or returning to one you’d stopped playing, with a defined goal (performing at a school event, recording an album of covers)
• Starting a creative writing project — a blog, a short story collection, a poetry chapbook — with a plan to share or publish it
• Designing and building something practical: a piece of furniture, an app prototype, a fashion line, a short film
• Organising a school arts showcase, exhibition, or open mic night

Activity Ideas

• Training for a specific physical goal — a half-marathon, a martial arts belt grading, a sport-specific fitness target
• Joining or helping coach a school or community sports team
• Taking up a new physical discipline entirely — rock climbing, dance, swimming — rather than continuing an activity you’ve already mastered
• Organising a regular activity session for younger students or peers, such as a fitness class or sports coaching programme

Service Ideas

• Tutoring or mentoring younger students in a subject you’re strong in, ideally on a sustained, ongoing basis
• Volunteering with a local organisation whose mission you genuinely care about, rather than the first opportunity that appears convenient
• Running an awareness campaign or fundraiser for a cause connected to a global issue you’re engaged with
• Environmental service — clean-up drives, conservation volunteering, sustainability initiatives — ideally sustained rather than a single event

Reflections: The Part of CAS Students Underestimate Most

Because CAS has no formal grade, students often treat reflections as a bureaucratic afterthought — a box to check in an online portfolio system rather than something worth real thought. This is a mistake. Reflections are how your coordinator (and, indirectly, the IB through moderation) actually sees the substance of your CAS engagement. An activity with no meaningful reflection attached is functionally invisible from an assessment standpoint, no matter how much genuine effort went into the activity itself.

What a Strong Reflection Actually Looks Like

A weak reflection describes what happened: ‘This week I coached the younger students’ football practice. It was fun and I think they improved.’ A strong reflection connects the experience to specific learning outcomes and demonstrates genuine self-awareness: ‘Coaching this week highlighted a gap between how I explain a drill and how a ten-year-old actually processes instructions — I had to abandon my planned explanation and improvise a simpler demonstration, which made me realise how much of coaching is really about reading your audience rather than just knowing the content yourself.’

• Be specific: name a particular moment, decision, or challenge rather than summarising the whole experience generically.
• Reference learning outcomes explicitly where relevant: connect what happened to self-awareness, new challenges, perseverance, collaboration, global issues, or ethics.
• Reflect throughout, not just at the end: ongoing reflections written close to each experience are far stronger than a handful of reflections reconstructed from memory months later.
• Be honest about setbacks: reflections that only describe successes read as less genuine than ones that also engage with difficulties, mistakes, or things that didn’t go as planned.

Meeting Your School’s CAS Requirements

While the IB sets the overall framework, the practical day-to-day requirements — how often you log experiences, which portfolio platform you use, how many formal reviews you’ll have with your CAS coordinator — are set by your individual school. Most schools schedule at least one formal meeting per term with your coordinator to review your ongoing engagement and flag any strand that’s under-represented well before it becomes a problem near the end of the programme.

Common CAS Challenges and How to Handle Them

• Idea generation paralysis: start from genuine existing interests rather than searching for the ‘perfect’ CAS activity — most strong CAS programmes are built from ordinary interests pursued with real commitment, not unusually impressive-sounding pursuits.
• Procrastination on documentation: build a habit of logging and reflecting weekly rather than relying on memory later — even a five-minute reflection written the same day beats a detailed one written months afterward.
• An imbalanced CAS programme: review your engagement across all three strands roughly every term, and proactively address any strand that’s falling behind rather than waiting for a coordinator to flag it.
• Struggling to find a genuine CAS project: look for opportunities to formalise something you’re already doing informally with peers into a defined, collaborative, sustained undertaking, rather than inventing something entirely new from scratch.

How PrepSeven Supports Students Through CAS

While PrepSeven’s core strength is subject tutoring and the EE and TOK core elements, we also help students think through CAS planning and portfolio review, since a well-documented CAS programme genuinely does affect whether the Diploma is awarded on time. We help students identify strand imbalances early, brainstorm CAS project ideas that fit their existing interests and school context, and review reflections for the kind of specificity and honesty that satisfies coordinators and IB moderation.

• CAS planning sessions to identify strand gaps well before final reviews
• Help brainstorming CAS project ideas that fit genuine student interests
• Reflection-writing guidance focused on specificity and the seven learning outcomes
• General DP core coordination alongside EE and TOK support

Frequently Asked Questions

Q1. How many CAS hours do I need to complete?

The current CAS framework does not set a fixed minimum number of hours; instead, it requires sustained, regular engagement across all three strands throughout the roughly 18-month CAS period, along with completion of at least one CAS project. Always confirm your specific school’s expectations with your CAS coordinator.

Q2. Can community service I already do count toward CAS?

Yes, provided it’s documented and reflected upon properly within your CAS portfolio during the official CAS period — ongoing commitments you already have are often excellent CAS material, since sustained engagement is exactly what CAS values.

Q3. What happens if I don’t complete CAS requirements?

CAS completion is required to be awarded the IB Diploma. A student who completes all six subject exams and the EE and TOK but has not satisfactorily completed CAS may not receive the Diploma until the CAS requirement is resolved with their coordinator.

Q4. Are there formal grades for CAS?

No. CAS is assessed on a completion basis by your school’s CAS coordinator against the seven learning outcomes, not graded on a numerical or letter scale the way subjects, the EE, or TOK are.

Q5. Can one activity count toward more than one CAS strand?

Yes — many strong CAS experiences naturally span more than one strand (for example, a fundraising concert involves both Creativity and Service), and CAS projects in particular are expected to typically touch more than one strand.

Q6. How often should I write CAS reflections?

Ideally close to each significant experience, rather than in occasional large batches — frequent, timely reflections are both easier to write well and more convincing to coordinators than reconstructed summaries written much later.

Q7. What exactly counts as a CAS project versus a regular CAS experience?

A CAS project is a specific, sustained collaborative undertaking lasting at least a month, involving genuine teamwork, planning, and typically more than one CAS strand — it’s a more structured, higher-commitment category than an ordinary ongoing CAS activity.