There is no set minimum number of Creativity, Activity, Service (CAS) hours for the International Baccalaureate (IB) Diploma. The IB Diploma Programme does not prescribe an exact number of hours; instead, it assesses CAS on the basis of seven learning outcomes that students must demonstrate over the two years of the program. Many schools still use roughly 150 hours over two years as a guideline.
The following sections answer the most important questions about CAS, from documentation to the right time to get started.
What Actually Counts as a CAS Hour?
Any activity that can be assigned to one of the three strands of Creativity, Activity, or Service and involves genuine personal commitment, reflection, and growth counts as a CAS activity. The activity must be new or significantly different from familiar routines and must not be part of regular school lessons or paid work.
The three strands can be distinguished as follows:
- Creativity: Artistic and creative activities such as drama, music, photography, design, or creative writing. Organizing a cultural event can also fall into this category.
- Activity: Physical activities that go beyond regular physical education classes, for example team sports, dance, climbing, or yoga.
- Service: Volunteer work and projects in which students make a real contribution to the community without being paid for it.
Why Are CAS Projects That Combine Several Strands Valuable?
CAS projects that combine at least two of the three strands are particularly valuable. A student who organizes a music concert in support of a local charity combines Creativity with Service while demonstrating initiative, planning, and teamwork.
How Many Hours Are Officially Required for CAS?
The IB does not officially prescribe a minimum number of hours for CAS. Earlier guidelines cited around 150 hours as a benchmark, but since the CAS framework was revised, the quality of experiences clearly takes precedence over quantity. What counts is demonstrating all seven learning outcomes, not reaching a certain number of hours.
Nevertheless, many schools recommend using roughly 150 hours over two years as a guideline, divided among all three strands. That corresponds to about three to four hours per week and is a realistic framework for credibly documenting all learning outcomes. It is important that activities take place regularly and are not all crammed in shortly before the end of the program.
What Are the Seven CAS Learning Outcomes?
The seven CAS learning outcomes are the IB’s actual assessment criteria for CAS. Over the course of the two years, every student must demonstrate all seven learning outcomes through concrete experiences and reflections. They describe what is meant to be learned and developed through CAS.
The seven learning outcomes are:
- Identify strengths and areas for growth: Students recognize what they are good at and where they want to develop further.
- Take on challenges and develop new skills: They step out of their comfort zone and learn something new.
- Show personal initiative and responsibility: Activities are planned and carried out independently.
- Demonstrate perseverance and commitment: Long-term projects require staying power, even in the face of setbacks.
- Work collaboratively with others: The focus is on teamwork and achieving goals together.
- Recognize global significance: Students understand how their activities fit into a broader social context.
- Recognize and consider ethical issues: They reflect on the ethical dimensions of their actions and decisions.
Not every single activity has to cover all seven learning outcomes. Across the full range of CAS experiences, however, each learning outcome should be demonstrated at least once.
What Happens if CAS Is Not Completed?
If CAS is not successfully completed, students do not receive the IB Diploma. CAS is a required component of the IB Diploma Programme and cannot be offset by academic achievement, no matter how good the grades in the other subjects are.
The IB considers CAS to be equal in importance to the academic part of the program. Anyone who does not demonstrate all seven learning outcomes, submits inadequate reflections, or neglects documentation puts the entire diploma at risk. Schools are obliged to review CAS progress regularly and to warn students early if necessary.
In practice, failing CAS entirely is rare when students receive good support from the start. Problems arise mainly when CAS is regarded as unimportant and put off.
How Do You Document CAS Activities Correctly?
CAS activities are documented in a CAS portfolio that contains regular reflections, evidence of the activities, and an overview of the learning outcomes. The documentation must show that the activities really took place and that genuine personal growth occurred.
A good CAS portfolio contains:
- Regular reflection entries: Not mere descriptions, but honest thoughts about what was learned, what was difficult, and how one has developed.
- Evidence of activities: Photos, emails from organizations, certificates of participation, or similar proof.
- Links to the learning outcomes: Each entry should make clear which learning outcome the activity demonstrates.
- Reflection on CAS projects: Longer, independent projects require a deeper engagement with planning, implementation, and results.
Most schools use digital platforms such as ManageBac for CAS documentation. The key is to write entries promptly, not weeks after the activity.
When Should You Start CAS?
You should start CAS at the beginning of grade 11, that is, on the first day of the IB Diploma Programme. An early start gives students enough time to develop all seven learning outcomes organically and avoids the stress of having to make up activities shortly before the end of the program.
Experience shows that many students underestimate the time required for CAS at the beginning. Those who plan and begin concrete activities in the first weeks of grade 11 can spread CAS comfortably over two years. Those who wait often come under pressure and end up submitting superficial reflections that do not meet the IB’s standards.
Another advantage of starting early: students often discover activities they truly care about and continue them beyond what is required. That is exactly the spirit of CAS.
How Does ISR International School on the Rhine Support Students With CAS?
CAS is more than a required component of the IB program. It is an opportunity for personal development that needs guidance. At ISR International School on the Rhine in Neuss, near Düsseldorf, Germany, we know that students should not be left on their own with it.
As a certified IB World School, we offer our upper school students structured and personal guidance throughout the entire CAS process. Learn more about CAS projects at ISR.
- Individual support from experienced CAS coordinators who hold regular feedback meetings
- Access to a wide range of school-based CAS activities in all three strands of Creativity, Activity, and Service
- Support in planning and carrying out their own CAS projects, including guidance on reflection
- Three full-time University and Career Counselors who accompany students throughout their IB journey and also keep an eye on CAS
- Digital documentation tools that help students keep their portfolio structured and complete
Our goal is for every student to experience CAS not as a hurdle but as one of the most formative experiences of their school years. Would you like to learn more about our IB program and the opportunities at our school? We warmly invite you to attend one of the ISR Info Days.
