Can I use my IA experiment as a CAS experience?

No, the experiment required for your IA should not also be recorded as CAS. It forms part of assessed Diploma Programme course work, even if conducting it involves creativity, persistence, or practical activity. You may undertake a separate CAS experience related to the same scientific issue, provided it has independent aims, actions, evidence, and reflection. For example, an environmental IA and a separately organized conservation project might share a theme without sharing the assessed experiment. Ask both your subject teacher and CAS coordinator to approve the separation before you begin.

Can my Extended Essay topic inspire a CAS project?

Yes, an EE topic can inspire a separate CAS project because the IB rule does not prohibit shared interests or themes. The project must not consist of conducting required EE research, writing the essay, completing reflections, or producing another assessed element. It should have its own CAS purpose, planning process, participants, evidence, and reflection. A literature EE might inspire an independent reading initiative, for example, but the initiative cannot replace the essay’s literary analysis. Obtain approval from your CAS coordinator and discuss any research connection with your EE supervisor.

Can time spent researching or writing my EE count as CAS creativity?

No, required EE research and writing cannot normally count as the creativity strand of CAS. The EE is a compulsory and assessed part of the DP core, while a CAS experience must not be used or included in DP course requirements. Calling academic writing creative does not change the purpose for which the work is being completed. Separate creative work inspired by the topic may qualify if it exists independently of the essay. Your CAS coordinator must decide whether that separate activity meets your school’s approval standards.

Can I collect IA or EE data during a CAS project?

This is a grey area that requires approval before any data collection begins. Using a CAS setting for academic research can blur the distinction between the experience and assessed work. It can also raise consent, privacy, safeguarding, and research ethics issues, particularly when children or community participants are involved. Your subject teacher or EE supervisor must confirm that the proposed method is academically appropriate, while your CAS coordinator must confirm that the experience remains valid CAS. If a clean separation cannot be demonstrated, collect academic data elsewhere or choose a different CAS activity.

Can the same evidence appear in my CAS portfolio and IA or EE?

You should not use the same document, report, data set, video, website, or written reflection as evidence for both CAS and assessed work. Doing so suggests that one product is being used to satisfy two different DP requirements. Keep separate folders and identify the purpose of every item before uploading it. CAS evidence should demonstrate participation, planning, progress, and reflection, while IA or EE material should meet the relevant academic requirements. If one photograph or contextual item could reasonably relate to both, ask your coordinator before including it rather than assuming it is acceptable.

Who makes the final decision about CAS overlap at my school?

Your school’s CAS coordinator is normally responsible for approving experiences and confirming that you have met the CAS requirements. Subject teachers and EE supervisors advise on the academic assessment, but they may not be able to approve an activity as CAS. The IB establishes the general requirement that CAS experiences must not be used or included in Diploma Programme course requirements. Schools may apply stricter local procedures to make authentication and record keeping clearer. For that reason, obtain coordinator approval before starting any CAS activity connected to an IA or EE.

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Can CAS Overlap With Your IA or EE?

CAS CAS Questions IB IB Extended Essay

RevisionDojo Team

•Last updated: 21 Oct 2026•9 min read

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Can CAS Overlap With Your IA or EE?

CAS CAS Questions IB IB Extended Essay

RevisionDojo Team

•Last updated: 21 Oct 2026•9 min read

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For M28 students, who began DP1 in August 2026 and take final examinations in May 2028, CAS can overlap thematically with an IA or Extended Essay. However, the CAS experience itself must not be used or included in assessed Diploma Programme work.

You may explore the same broad interest in both areas, provided the activities, evidence, reflections, and academic submission remain clearly separate. The safest principle is straightforward: one piece of work should not satisfy two DP requirements.

The official IB rule on CAS overlap

The IB describes creativity, activity, service (CAS) as one of the three elements of the DP core. CAS does not contribute points to the diploma score, but completing its requirements is necessary to receive the diploma.

The official IB CAS subject brief states that a CAS experience must “not be used or included in the student’s Diploma course requirements.” An IA is assessed subject work, while the EE is an assessed core requirement. Therefore, the work submitted for either cannot simultaneously count as CAS.

This rule does not require CAS, IAs, and the EE to concern completely unrelated topics. It prevents students from using the same work, not from making meaningful connections between independent activities.

Situation	Usually acceptable?	Reason
CAS and an IA share a broad theme	Potentially	The actions, outputs, and evidence must remain separate.
IA data collection is recorded as CAS	No	The data collection is part of assessed course work.
EE research hours count as CAS creativity	No	EE research is a DP requirement.
A service project develops from an academic interest	Potentially	It can qualify if it has independent CAS aims and evidence.
The same report appears in CAS and an IA	No	One product is being used for two requirements.

What acceptable thematic overlap looks like

Suppose your Biology IA investigates how nitrate concentration affects algal growth. Separately, you join a sustained community project that removes litter from waterways and teaches younger students about local water quality.

The activities share an environmental theme, but they serve different purposes. The IA is a controlled scientific investigation assessed against Biology criteria. The CAS experience involves planning, participation, community engagement, and reflection against CAS learning outcomes.

Similarly, an English EE about representations of migration could inspire a community storytelling event. The EE remains literary research and academic writing, while the event requires separate organization and participation. You must not present your EE research, essay, or required reflection sessions as CAS work.

Ask yourself:

Would I undertake this CAS experience if it could not appear in my IA or EE?
Can I explain the CAS activity without claiming the assessed research, experiment, essay, or product as evidence?

If either answer is no, the proposed overlap is probably too close.

Grey areas students should recognize

Using CAS as a research setting

A CAS project can create an interesting setting for an IA or EE. For example, running sports sessions might prompt questions about exercise physiology or participation rates.

Collecting assessed research data from CAS participants can create double-counting, consent, privacy, safeguarding, and research ethics concerns. Participation in CAS does not automatically give permission to use people or their data academically. Consult your subject teacher, EE supervisor, and CAS coordinator before collecting anything.

Creating one product for both tasks

A website, documentary, exhibition, lesson, or event may appear to meet both CAS and academic requirements. This becomes risky when the same product is assessed and entered in the CAS portfolio.

Create genuinely distinct outcomes instead. An assessed task could be an analytical essay, while a CAS team independently plans and delivers workshops. Simply dividing or relabelling one product does not create two separate activities.

Applying classroom knowledge

Applying subject knowledge during CAS is different from submitting CAS work for assessment. A Chemistry student could use knowledge about acids and bases while helping to run an independent science activity for children.

The CAS value comes from planning, communication, action, and reflection, not from claiming ordinary course work as an experience. The IB overview of CAS explains the wider purpose of this part of the core.

Why school rules may be stricter

The IB establishes the general principle, while schools create procedures for approving experiences, recording evidence, conducting interviews, and resolving overlap. A school may prohibit close connections because complete separation is easier to authenticate.

Before beginning a connected project, show your coordinator:

the proposed CAS aims and strands
the actions completed specifically for CAS
the academic question and assessment involved
separate outputs and evidence
any consent, data, or safeguarding concerns

Request approval in writing where possible. Informal encouragement from a teacher is not necessarily CAS coordinator approval.

How to keep CAS, IA, and EE work separate

Create separate plans from the beginning. Your CAS plan should identify its purpose, stages, actions, intended learning outcomes, evidence, and reflections. Your academic plan should focus on the research question, method, subject criteria, sources, analysis, and deadlines.

Keep separate folders and records. CAS reflections should discuss decisions, challenges, collaboration, and personal development, while IA or EE reflections should address the academic research process in the required format.

Do not copy text between an EE reflection and a CAS portfolio entry or count time spent writing assessed work as CAS. RevisionDojo offers guidance on what CAS involves, balancing CAS during academically demanding periods, and creating an IA deadline plan.

A practical independence test

Compare the plans before requesting approval:

CAS plan	IA or EE plan
Community or personal purpose	Focused academic research question
Planned action and participation	Research method and subject analysis
CAS evidence and ongoing reflections	Drafts, citations, and academic reflections
CAS learning outcomes	Published assessment criteria

The plans may influence each other intellectually, but they should not describe the same required work. If most entries would be identical, redesign the CAS experience or choose another activity.

Conclusion

CAS may share a theme or source of inspiration with an IA or EE, but it cannot consist of the assessed research, data collection, writing, or product required for that assessment. Secure coordinator approval before starting and maintain separate plans, evidence, outputs, and reflections.

RevisionDojo can support your planning through its guide to balancing EE research, coursework resources, and Jojo AI. Your school’s CAS coordinator, however, remains responsible for approving the experience.