Extended Essay Criteria A-E: Marks, Grades & Tips

By Michael Thompson · Former IB Diploma Programme coordinator; 10 years at Bromsgrove School · Published 4 September 2026

The extended essay criteria determine every mark your 4,000-word paper earns, yet many students only read them once, at the start. There are five criteria - Focus and Method, Knowledge and Understanding, Critical Thinking, Presentation, and Engagement - worth a combined 34 marks. Those marks map to a grade band of A through E, which then feeds into the TOK-EE matrix that adds up to three bonus points to your IB Diploma total. Understanding exactly what each criterion rewards, and what it penalises, is the most direct way to write a stronger essay.

Key Takeaways

In This Article

  1. What the extended essay criteria are and how they fit together
  2. Criterion A - Focus and Method (6 marks)
  3. Criterion B - Knowledge and Understanding (6 marks)
  4. Criterion C - Critical Thinking (12 marks): the biggest decider
  5. Criterion D - Presentation (4 marks) and source requirements
  6. Criterion E - Engagement (6 marks) and the RPPF
  7. How the 34 marks become a grade - and feed into the diploma
  8. What to do next

1. What the extended essay criteria are and how they fit together

The extended essay criteria are the five categories that external IB examiners use to mark every finished essay. According to the IB's assessment overview, the five criteria and their marks are:

CriterionTitleMarks
AFocus and Method6
BKnowledge and Understanding6
CCritical Thinking12
DPresentation4
EEngagement6
Total34

One thing many students miss: the marking is done by examiners appointed by the IB, not by your supervisor. Your supervisor reads drafts and runs reflection sessions, but has no role in the final mark. That distinction matters because writing to impress a familiar teacher is a different task from writing to be understood by a stranger reading thousands of essays.

This guide covers the current 34-mark model, which is the version in use for students being assessed now. A revised framework totalling 30 marks is due to launch with first assessment in May 2027, so if your first assessment falls after that date, check which model your cohort sits under before relying on the mark allocations above.

2. Criterion A - Focus and Method (6 marks)

Criterion A is where examiners decide whether your essay has a real intellectual direction or is just a vague wander through a subject area. According to the IBO assessment guide, it assesses three distinct strands: the research topic, the research question, and the methodology. Six marks are available, distributed across four bands.

What each band looks like

BandResearch questionSources and methodology
1-2Stated but not clearly expressed, or too broad for 4,000 wordsLimited range, little evidence of informed choice
3-4Clearly stated but only partially focusedGenerally relevant and appropriate, some evidence of informed selection
5-6Clearly stated, focused, and "appropriately connected to the discussion in the essay"Appropriate range with "evidence of effective and informed selection"

*Source: IBO extended essay guide, Criterion A descriptors*

The subject-appropriateness penalty

One quirk that catches students out: if your topic or research question is deemed inappropriate for your registered subject, the maximum you can score on Criterion A is 4 marks, regardless of how well-written the question is. A Chemistry essay that reads more like a Biology essay, for instance, can be capped before an examiner even looks at your methodology.

What separates a 5-6 from a 3-4

The word "connected" in the top-band descriptor is doing a lot of work. A 5-6 research question is not just focused in isolation; it is phrased so that the structure of the essay follows directly from it. At the 3-4 level, the question exists but the methodology feels assembled rather than designed. The IBO guide also specifies that sources must each contribute directly to the research focus; general breadth of sources is not enough on its own.

A practical check: if you could swap your methodology section into a different essay with a different RQ and it would still make sense, your method is not sufficiently tailored. That is a 3-4 answer, not a 5-6.

3. Criterion B - Knowledge and Understanding (6 marks)

Criterion B is worth 6 marks and is assessed against two strands: context, and subject-specific terminology and concepts. According to the IB extended essay guide, both strands sit under the heading "Knowledge and Understanding."

The counter-intuitive point examiners make explicit is this: you are not rewarded for displaying subject knowledge that is not essential to the research question. A student who writes three paragraphs of general background theory to demonstrate how much they know will not score higher than one who applies only what the question demands, precisely. Breadth without relevance is noise.

The two strands in practice:

The gap between a high and mid-band score here is usually precision. At the top band, terminology is used correctly every time it appears. At a mid-band, terms appear but are inconsistently applied or occasionally mismatched to the concept they describe.

Source quality also feeds into this criterion. Sources must contribute directly to the research focus, not simply show that you consulted widely.

Practical check: read each paragraph of your background section and ask whether it would still be necessary if your research question changed. If the answer is yes, cut it.

4. Criterion C - Critical Thinking (12 marks): the biggest decider

Criterion C is worth 12 marks out of 34. That makes it worth more than criteria B, D, and E combined. If you are short on revision time, this is where to spend it.

The criterion covers three strands:

The counterintuitive thing most students miss: examiners are not looking for a confident conclusion. A balanced evaluation that acknowledges where the evidence is thin scores higher than a tidy argument that ignores inconvenient data. A student who says "this result is consistent with X but limited by Y sample size" is demonstrating exactly what the top band requires.

What separates A-grade work from C-grade work on this criterion is depth, not volume. A C-grade response typically contains analysis, but it stays descriptive: restating what a source says rather than interrogating it. An A-grade response connects the analysis to the research question, weighs competing interpretations, and reaches conclusions that are visibly consistent with the evidence presented.

One specific requirement cuts across all subjects: any element taken from a source must be accompanied by a citation. The mathematics guidance states this explicitly, and the principle applies everywhere. An unattributed claim in your analysis, even a minor one, weakens the research strand of this criterion regardless of how strong the surrounding argument is.

5. Criterion D - Presentation (4 marks) and source requirements

Criterion D covers the formal scaffolding of the essay: structure, layout, bibliography, and compliance with the word limits set by the IB. It is worth 4 marks out of 34.

Where sources are actually assessed matters. There is no standalone "sources" criterion. Source selection sits inside Criterion A (methodology) and Criterion B (contextual knowledge). What Criterion D examines is citation accuracy and bibliography completeness - whether every source referenced in the text appears in the bibliography, and whether the referencing style is applied consistently throughout.

"Appropriate" sources, in practice, means sources that bear directly on the research question and are cited wherever they are used. A source that appears in the bibliography but is never cited in the body text is a red flag to examiners, not a sign of thorough research.

The two limits to know:

The counter-intuitive catch: tables, charts, and diagrams are excluded from the word count, but a student who packs in excessive visuals to circumvent the limit can still lose marks under Criterion D if the presentation looks padded or incoherent.

6. Criterion E - Engagement (6 marks) and the RPPF

Criterion E is the one part of the extended essay assessment that examiners never read your essay to judge. It is assessed entirely from the Reflections on Planning and Progress Form (RPPF), a separate document capped at 500 words, submitted alongside the essay itself. The essay could be outstanding and still score poorly here if the RPPF is thin.

Per the IB's extended essay guide, students must complete **three mandatory reflection sessions with their supervisor across the research period. The third of these is the viva voce**, a concluding interview with the supervising teacher. The viva voce is not just a formality: it gives the supervisor direct evidence of intellectual engagement that informs what they countersign on the RPPF.

One non-obvious detail: the supervisor countersigns the RPPF to confirm its authenticity, but they do not mark it. External examiners appointed by the IB assess Criterion E independently. A supervisor who proofreads or softens a student's reflections is therefore doing the student a quiet disservice.

The difference between a high and a low score comes down to one word: evaluative versus descriptive.

Treat each reflection entry as a response to the question: "How has my thinking about this topic shifted, and why?"

7. How the 34 marks become a grade - and feed into the diploma

!Extended essay and TOK grade matrix showing core bonus points from 0 to 3 for each grade combination.webp15960

Per the IB, your extended essay is marked on a scale of 0 to 34, which maps onto five grade bands:

GradeDescriptor
AExcellent
BGood
CSatisfactory
DMediocre
EElementary

The exact raw-mark thresholds for each band are set by the IB each session and are not published in advance, so a score of, say, 28 does not guarantee an A across all sessions.

**Those grades then feed directly into your diploma total.** The IB combines your TOK and EE grades using a matrix to award 0 to 3 bonus points. A concrete example from the IB's published matrix: a B in TOK combined with a C in the EE earns 2 core points.

The counterintuitive risk here is that a strong subject performance cannot rescue a failing EE. An E grade in the extended essay is a diploma-failing condition outright, regardless of how many points you score elsewhere.

The full diploma arithmetic works like this:

A student who earns an E in the EE is disqualified from the diploma even if their subject scores would otherwise clear that 24-point threshold.

8. What to do next

Pull up your extended essay proposal or draft this week and map every section against Criteria A through E. The most counter-intuitive thing to check: Criterion C carries 12 of the 34 marks, yet many students treat it as a finishing touch rather than a structural frame. If your argument isn't built around evidence analysis and reasoned evaluation from the first body section onward, no amount of polished presentation in Criterion D will close that gap.

One concrete action: book a meeting with your supervisor before your school's next internal checkpoint and bring a one-page outline that names your research question, your method, and your three strongest analytical points. Ask them specifically which descriptor level your focus and method currently sit at. That conversation is more useful than re-reading any guide.

FAQ

Who marks the extended essay - my supervisor or an IB examiner?

All extended essays are externally assessed by examiners appointed by the IB; the supervisor's role is to support the student and countersign the RPPF, not to award marks.

Does the RPPF count towards my extended essay mark?

Yes - the RPPF is the evidence base for Criterion E (Engagement), which is worth 6 of the 34 marks available.

What happens if I get an E in the extended essay?

An E grade in the extended essay is a diploma-failing condition under the DP passing criteria, regardless of how many points you earn across your six subjects.

How do extended essay grades combine with TOK for bonus points?

The IB uses a combined TOK-EE matrix to award 0-3 bonus points; for example, a B in TOK and a C in the EE gives 2 core points.

Are the mark thresholds for each extended essay grade fixed every year?

No - the IB sets the grade boundaries for A through E after each examination session, so the same raw score can fall in different bands in different years.

Which extended essay criterion covers the quality of my sources?

Source selection is assessed within Criterion A (methodology strand) and Criterion B (context strand); accurate citation and bibliography completeness fall under Criterion D (Presentation).

References