The CAS Stages (DP IB Creativity, Activity, Service): Revision Note

Dr Dean West

Written by: Dr Dean West

Reviewed by: Alistair Marjot

Updated on

What are the CAS stages and how do they guide CAS?

The five stages of CAS

  • The CAS stages are five steps consisting of investigation, preparation, action, reflection and demonstration—provide a supportive structure for the CAS programme

  • Investigation—the initial stage where students identify their interests, skills and talents to determine the purpose of a CAS experience

    • In the context of Service, students use this stage to identify an authentic need they want to address

  • Preparation—the stage where students clarify roles and responsibilities, develop an action plan and identify needed resources or timelines

    • Students may also use this time to acquire specific skills required for the experience

  • Action—the stage where students implement their idea or plan through individual or collaborative effort

    • This often requires students to engage in decision-making and problem-solving

  • Reflection—the ongoing process of describing what happened, expressing feelings and generating new ideas or questions

    • This occurs intermittently to help students learn from the experience and make connections to personal growth

  • Demonstration—the final stage where students make explicit what and how they have learned and what they have accomplished

    • Students may share their journey through their CAS portfolio—a collection of evidence and reflections—or through informal and formal presentations

The stages as a method for doing CAS

  • The stages should be viewed as the actual method for "doing" CAS rather than just a tool for planning

  • They provide a reliable yet flexible structure that helps students move from conceiving an idea to executing a plan

  • For a CAS project—a collaborative series of sequential experiences lasting at least one month—following all five stages is essential

  • For singular CAS experiences—specific events where a student engages with one or more strands—students may not evidence every stage

    • Students might start a singular experience at the investigation, preparation or action stage

    • For ongoing experiences, it is advised to always begin with investigation

How do the CAS stages support student learning?

Enhancing personal development

  • The framework encourages students to increase their self-awareness and learn about their own learning processes

    • It supports students in exploring new and unfamiliar challenges while employing different learning styles

  • Following these stages allows students to develop their ability to communicate and collaborate effectively with others

  • The process helps students develop the attributes of the IB learner profile—ten qualities valued by IB World Schools to help students become responsible community members

Ensuring purposeful engagement

  • The stages ensure that CAS is a student-led journey of discovery rather than a simple "tick-box" checklist of tasks

    • They help students clarify the purpose of their actions and consider the ethical implications of their choices

  • By using this framework, students can identify clear learning goals and provide better evidence of their growth

  • The stages provide a process and sequence that students can apply with confidence to future situations beyond the Diploma Programme

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Dr Dean West

Author: Dr Dean West

Expertise: Content Writer

Dr Dean West is a UK-based educator, Principal Examiner and assessment specialist. He leads IB CAS and the Extended Essay at Bromsgrove School, where he also coordinates and teaches IB Business Management. A Chartered Teacher and Chartered Educational Assessor, he has examined for WJEC, Cambridge International and Edexcel, consulted for Ofqual and the British Council. He holds a PhD in Education from the University of Warwick.

Alistair Marjot

Reviewer: Alistair Marjot

Expertise: Environmental Systems and Societies & Biology Content Creator

Alistair graduated from Oxford University with a degree in Biological Sciences. He has taught GCSE/IGCSE Biology, as well as Biology and Environmental Systems & Societies for the International Baccalaureate Diploma Programme. While teaching in Oxford, Alistair completed his MA Education as Head of Department for Environmental Systems & Societies. Alistair has continued to pursue his interests in ecology and environmental science, recently gaining an MSc in Wildlife Biology & Conservation with Edinburgh Napier University.