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If you are an IB Diploma student, you already know that the Creativity, Activity, Service (CAS) program is a huge part of your life outside the traditional classroom. But while you are busy planning your CAS project, practicing an instrument, or volunteering, there is one person that you must build a good relationship with – your CAS Supervisor. In this post, we'll break down exactly who this person is, why they matter, and how to work with them effectively.
IB CAS Supervisor Explained
Who is a CAS Supervisor?
A CAS Supervisor is an adult who oversees and validates a specific CAS experience you are undertaking. A CAS Supervisor is not the same person as your school’s main CAS Coordinator. Your Coordinator manages the entire school's program, while your Supervisor is the person directly on the ground with you for a specific activity. For example, if you are coaching a junior soccer team for your "Activity" strand, your Supervisor might be the head coach of the club. If you are taking pottery classes for "Creativity," it could be your art teacher or studio instructor.
Who Can Be a CAS Supervisor?
The IB is incredibly strict about this rule to ensure the integrity of your portfolio:
Who it can be – A teacher, a club leader, a coach, a camp counsellor, or a community supervisor. It must be a responsible adult who is present during your activity and can confirm that you have completed it effectively.
Who it cannot be – Your parents, siblings, or friends. Even if your mom is the certified instructor of your yoga class, the IB will not accept her signature. You must find an independent adult to vouch for you.
If you are doing a self-directed activity where an adult isn't physically there (e.g. teaching yourself to cook at home), you generally won't have a traditional supervisor. Instead, you will need to discuss with your CAS Coordinator beforehand how to provide solid evidence (like videos, photos, or logs) instead of a supervisor's report.
What Does the CAS Supervisor Do?
Your CAS Supervisor has three main jobs:
Safety and Guidance – They make sure you are actually showing up, staying safe, and behaving appropriately during the CAS experience.
Mentorship – They are there to offer advice on completing the CAS activity. If you hit a roadblock, a good supervisor will help you problem-solve and identify what CAS learning outcomes you developed from the experience.
The Final Review – At the end of your experience, they need to verify that you completed the hours or goals you set out to achieve. This is usually done via a quick online form or an email confirmation sent through your school’s CAS tracking platform (e.g. ManageBac).
How to Build a Good Relationship with your CAS Supervisor
Managing your CAS supervisors doesn't have to be difficult if you follow a few basic professional habits, as outlined here:
Ask them before you start – Never add an adult's email address into your CAS portal without asking them first. Give them a quick heads-up about what CAS is and what will be expected of them.
Keep them in the loop – If you are going to miss a session of the activity or if your project goals change midway, communicate with your supervisor early. This allows them to understand how your CAS goals are changing and to effectively support you through the process.
Don't wait until the last minute – Do not ask your supervisor to sign off on a 6-month project a few days before your school’s final IB deadline. Give them at least a week's notice out of respect for their time.
Your CAS Supervisor is ultimately there to help you grow outside of your academic classes. Treat them with respect, communicate clearly, and you’ll have no problem getting those final checkmarks needed to secure your IB Diploma!
We hope you found this post helpful. For more useful materials associated with the IB, check out the wide variety of IA, EE and TOK exemplars available at Clastify and other guides available on our blog.
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