Mastering the IB DP Core: TOK, EE and CAS Explained

29th October, 2026 | Abhishek Malani | 14 Min Read
Introduction
The International Baccalaureate Diploma Programme (IB DP) is known for its academic rigour, but students do not earn the diploma through subject examinations alone. Alongside their six academic subjects, they must complete three essential components: Theory of Knowledge (TOK), the Extended Essay (EE), and Creativity, Activity, Service (CAS). These form the IB Core.
This guide by Quest For Success explains the three components, how they are scored, and how students should plan the Core across the two years of the IB DP.
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Table of Contents

What Is the IB DP Core?

The IB DP Core consists of three compulsory components that complement the six academic subjects students study during the Diploma Programme.
  • Theory of Knowledge (TOK): Examines how knowledge is produced, interpreted and justified. Students explore questions about what we know, how we know it and how perspectives influence our understanding of the world
  • Extended Essay (EE): An independent research project in which students investigate a focused question and present their findings in an academic essay.
  • Creativity, Activity, Service (CAS): Encourages students to participate in creative pursuits, physical activity and service experiences, reflecting on their learning and personal development.
Each component has distinct requirements and completion criteria. TOK and the Extended Essay receive individual letter grades, which are combined through the official Core points matrix to award up to three additional points towards the diploma. CAS does not receive a numerical grade or contribute points to this matrix, but successful completion is compulsory.

What Are the IB Core Requirements?

TOK requirements
TOK is assessed through two tasks: the TOK exhibition and the 1600-word TOK essay. The exhibition explores how TOK manifests in the real world through three objects, while the essay responds to a prescribed title issued for the relevant examination session.
Extended Essay requirements

The Extended Essay is an independent research project culminating in an academic paper. Under the established EE format, the essay has a maximum length of 4,000 words. Students select an approved subject or interdisciplinary approach, develop a focused research question, conduct research and construct a reasoned argument.

The process includes supervision and mandatory reflection sessions. Students must follow the requirements for research, writing, referencing, reflection and submission that apply to their examination session. They must also ensure that the work is their own and that sources are acknowledged appropriately.
Note: The IB has introduced a revised Extended Essay course, with first assessment in May 2027. Requirements and assessment criteria may differ by examination session, so students should follow the EE guide and instructions that apply to their cohort.
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CAS requirements
CAS runs throughout the Diploma Programme and involves meaningful engagement across three strands:
  • Creativity: Experiences involving creative thinking, artistic pursuits or other forms of creative expression.
  • Activity: Physical exertion that contributes to a healthy lifestyle.
  • Service:Voluntary, unpaid engagement that benefits others and provides opportunities for learning.
Students must document their experiences, reflect on their learning and provide evidence of progress towards the seven CAS learning outcomes. They must also complete at least one CAS project that involves planning, initiative, perseverance and collaboration.
CAS is not graded on the same letter scale as TOK and the EE. Instead, the school determines whether the student has met the completion requirements.

How Do TOK and the Extended Essay Earn the 3 Core Points?

One of the most common misunderstandings about the IB Core is how its three additional points are awarded.
TOK and the Extended Essay are assessed separately and each receives a letter grade from A to E, with A representing the highest grade. The IB then combines these grades using the official Core points matrix to determine how many bonus points a student receives.
The combination can contribute zero, one, two or three pointstowards the overall IB Diploma score. Some grade combinations also constitute a failing condition, regardless of the number of points that might otherwise have been awarded.
CAS is not included in this calculation. It is a separate diploma requirement that students must complete successfully.
The official IB Core points matrix
The following matrix reproduces the combinations shown in the IB’s official DP passing criteria page, as of February 2026.
- TOK

Extended Essay

A
B
C
D
E
A
3 points
3 points
2 points
2 points
Failing condition
B
3 points
2points
2 points
1 points
Failing condition
C
2 points
2 points
1 points
0 points
Failing condition
D
2 points
1 points
0 points
0 points
Failing condition
E
Failing condition
Failing condition
Failing condition
Failing condition
Failing condition
To use the matrix, students need their TOK and EE grades. Find the EE grade in the left-hand column, then move across to the column corresponding to the TOK grade. The intersecting cell shows the number of Core bonus points awarded or indicates a failing condition.
Example: A student receives a B in TOK and a C in the Extended Essay. The matrix awards two Core points. These points are added to the student’s six subject scores when calculating the total diploma score.

What Happens If You Fail TOK, the EE or CAS?

A low grade, a missing submission and an unmet completion requirement are not necessarily treated in the same way. Students who are concerned about their results should consult their subject teacher or coordinator and check the official rules for their examination session.
A low TOK or EE grade can reduce the number of Core bonus points awarded.
An E in either TOK or the Extended Essay results in a failing condition under the official Core points matrix, regardless of the grade awarded for the other component.
There are also combinations that result in a student scoring 0 Core points, but they do not mean an automatic diploma failure.
CAS is compulsory even though it does not contribute numerical points to the diploma. If the school determines that a student has not met the CAS completion requirements, the student cannot be awarded the IB Diploma.

IB Core Deadline Calendar

The following is an indicative planning framework for students in the two-year IB DP. It is not an official universal deadline calendar. Schools set internal deadlines according to their own schedules, and official submission requirements depend on the examination session.
Stage TOK Extended Essay CAS
DP Year 1: Early stage
Understand the exhibition and essay requirements; begin exploring TOK concepts and prompts.
Explore research interests, choose a suitable subject and begin developing a research question.
Understand the CAS requirements, identify interests and begin planning experiences
DP Year 1: Later stage
Work towards the exhibition and other school milestones; review feedback.
Refine the research question, begin research and organise sources.
Build a sustained programme of experiences and record reflections and evidence.
Summer between DP1 and DP2
Follow school guidance on permitted preparation and any outstanding work.
Continue research or drafting in accordance with school guidance.
Continue experiences, reflections and project work where appropriate.
DP Year 2: Early stage
Complete and submit work according to school deadlines.
Finalise research, writing and reflections in line with the applicable requirements
Review progress towards the learning outcomes and complete remaining requirements
DP Year 2: Later stage
Confirm submission status and address any outstanding requirements through the school.
Confirm final submission and authenticity requirements with the supervisor
Confirm with the CAS coordinator that the school has verified completion.
Students can turn this framework into a personal tracker with the following fields:
  • Component or Task
  • School Deadline
  • Official Deadline
  • Current Status
  • Next Action
  • Teacher or Coordinator

How Quest for Success Can Help

Quest For Success provides comprehensive support tailored to each component of the IB Core. Through personalized 1-on-1 tutoring, experienced mentors assist students in navigating TOK prompts, refining Extended Essay research questions and arguments, and organizing meaningful CAS projects. With expert guidance, structured feedback, and tailored learning resources, Quest For Success helps students stay on track, meet critical deadlines, and maximize their Core points potential. To learn more and book your free demo class, contact us today.

Summary

The IB Core—comprising Theory of Knowledge (TOK), the Extended Essay (EE), and Creativity, Activity, Service (CAS)—is a vital and compulsory component of the IB Diploma Programme. While TOK and the EE combine through the official matrix to contribute up to three bonus points, CAS must be completed successfully to earn the diploma. Planning ahead and tracking key milestones can help students manage the Core requirements alongside their six academic subjects.
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FAQs

The IB DP Core is the compulsory part of the Diploma Programme that complements the six academic subjects. It consists of Theory of Knowledge (TOK), the Extended Essay (EE) and Creativity, Activity, Service (CAS). Together, these components encourage critical reflection, independent research and learning through experience.

The three components are TOK, the Extended Essay and CAS. TOK explores how knowledge is developed and justified. The EE is an independent research project culminating in an academic essay. CAS involves sustained participation in creativity, activity and service experiences, along with reflection and a required project.

TOK and the EE can contribute up to three additional points towards the overall IB Diploma score. Their individual letter grades are combined using the official Core points matrix. Depending on the combination, students receive zero, one, two or three points, or encounter a failing condition.

No. CAS does not receive a numerical grade and does not contribute points to the TOK and EE matrix. However, students must complete CAS successfully to receive the IB Diploma,

Yes, it is possible to receive the IB Diploma with zero Core bonus points, provided all other diploma-award requirements are met. Students must achieve at least 24 points overall and satisfy the other applicable conditions, including the required subject performance and successful completion of CAS. Zero Core points alone does not automatically mean a student fails the diploma.

Students should not assume that they can automatically resubmit TOK or EE work after receiving a low grade. Options depend on the circumstances, the examination session and the applicable IB rules. Students who are concerned about a submission or result should contact their teacher or DP coordinator for guidance on the options available to them.

Want more support with your IB Core subjects? Contact Quest For Success today!

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